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MAKE(1)                 FreeBSD General Commands Manual                MAKE(1)

     make - maintain program dependencies

     make [-BeikNnqrstWwX] [-C directory] [-D variable] [-d flags]
          [-f makefile] [-I directory] [-J private] [-j max_jobs]
          [-m directory] [-T file] [-V variable] [variable=value] [target ...]

     make is a program designed to simplify the maintenance of other programs.
     Its input is a list of specifications as to the files upon which programs
     and other files depend.  If no -f makefile makefile option is given, make
     will try to open `makefile' then `Makefile' in order to find the
     specifications.  If the file `.depend' exists, it is read (see mkdep(1)).

     This manual page is intended as a reference document only.  For a more
     thorough description of make and makefiles, please refer to PMake - A

     make will prepend the contents of the MAKEFLAGS environment variable to
     the command line arguments before parsing them.

     The options are as follows:

     -B      Try to be backwards compatible by executing a single shell per
             command and by executing the commands to make the sources of a
             dependency line in sequence.

     -C directory
             Change to directory before reading the makefiles or doing
             anything else.  If multiple -C options are specified, each is
             interpreted relative to the previous one: -C / -C etc is
             equivalent to -C /etc.

     -D variable
             Define variable to be 1, in the global context.

     -d [-]flags
             Turn on debugging, and specify which portions of make are to
             print debugging information.  Unless the flags are preceded by
             `-' they are added to the MAKEFLAGS environment variable and will
             be processed by any child make processes.  By default, debugging
             information is printed to standard error, but this can be changed
             using the F debugging flag.  The debugging output is always
             unbuffered; in addition, if debugging is enabled but debugging
             output is not directed to standard output, then the standard
             output is line buffered.  Flags is one or more of the following:

             A       Print all possible debugging information; equivalent to
                     specifying all of the debugging flags.

             a       Print debugging information about archive searching and

             C       Print debugging information about current working

             c       Print debugging information about conditional evaluation.

             d       Print debugging information about directory searching and

             e       Print debugging information about failed commands and

                     Specify where debugging output is written.  This must be
                     the last flag, because it consumes the remainder of the
                     argument.  If the character immediately after the `F'
                     flag is `+', then the file will be opened in append mode;
                     otherwise the file will be overwritten.  If the file name
                     is `stdout' or `stderr' then debugging output will be
                     written to the standard output or standard error output
                     file descriptors respectively (and the `+' option has no
                     effect).  Otherwise, the output will be written to the
                     named file.  If the file name ends `.%d' then the `%d' is
                     replaced by the pid.

             f       Print debugging information about loop evaluation.

             g1      Print the input graph before making anything.

             g2      Print the input graph after making everything, or before
                     exiting on error.

             g3      Print the input graph before exiting on error.

             j       Print debugging information about running multiple

             l       Print commands in Makefiles regardless of whether or not
                     they are prefixed by `@' or other "quiet" flags.  Also
                     known as "loud" behavior.

             M       Print debugging information about "meta" mode decisions
                     about targets.

             m       Print debugging information about making targets,
                     including modification dates.

             n       Don't delete the temporary command scripts created when
                     running commands.  These temporary scripts are created in
                     the directory referred to by the TMPDIR environment
                     variable, or in /tmp if TMPDIR is unset or set to the
                     empty string.  The temporary scripts are created by
                     mkstemp(3), and have names of the form makeXXXXXX.  NOTE:
                     This can create many files in TMPDIR or /tmp, so use with

             p       Print debugging information about makefile parsing.

             s       Print debugging information about suffix-transformation

             t       Print debugging information about target list

             V       Force the -V option to print raw values of variables.

             v       Print debugging information about variable assignment.

             x       Run shell commands with -x so the actual commands are
                     printed as they are executed.

     -e      Specify that environment variables override macro assignments
             within makefiles.

     -f makefile
             Specify a makefile to read instead of the default `makefile'.  If
             makefile is `-', standard input is read.  Multiple makefiles may
             be specified, and are read in the order specified.

     -I directory
             Specify a directory in which to search for makefiles and included
             makefiles.  The system makefile directory (or directories, see
             the -m option) is automatically included as part of this list.

     -i      Ignore non-zero exit of shell commands in the makefile.
             Equivalent to specifying `-' before each command line in the

     -J private
             This option should not be specified by the user.

             When the j option is in use in a recursive build, this option is
             passed by a make to child makes to allow all the make processes
             in the build to cooperate to avoid overloading the system.

     -j max_jobs
             Specify the maximum number of jobs that make may have running at
             any one time.  The value is saved in .MAKE.JOBS.  Turns
             compatibility mode off, unless the B flag is also specified.
             When compatibility mode is off, all commands associated with a
             target are executed in a single shell invocation as opposed to
             the traditional one shell invocation per line.  This can break
             traditional scripts which change directories on each command
             invocation and then expect to start with a fresh environment on
             the next line.  It is more efficient to correct the scripts
             rather than turn backwards compatibility on.

     -k      Continue processing after errors are encountered, but only on
             those targets that do not depend on the target whose creation
             caused the error.

     -m directory
             Specify a directory in which to search for and makefiles
             included via the <file>-style include statement.  The -m option
             can be used multiple times to form a search path.  This path will
             override the default system include path: /usr/share/mk.
             Furthermore the system include path will be appended to the
             search path used for "file"-style include statements (see the -I

             If a file or directory name in the -m argument (or the
             MAKESYSPATH environment variable) starts with the string ".../"
             then make will search for the specified file or directory named
             in the remaining part of the argument string.  The search starts
             with the current directory of the Makefile and then works upward
             towards the root of the file system.  If the search is
             successful, then the resulting directory replaces the ".../"
             specification in the -m argument.  If used, this feature allows
             make to easily search in the current source tree for customized
    files (e.g., by using ".../mk/" as an argument).

     -n      Display the commands that would have been executed, but do not
             actually execute them unless the target depends on the .MAKE
             special source (see below).

     -N      Display the commands which would have been executed, but do not
             actually execute any of them; useful for debugging top-level
             makefiles without descending into subdirectories.

     -q      Do not execute any commands, but exit 0 if the specified targets
             are up-to-date and 1, otherwise.

     -r      Do not use the built-in rules specified in the system makefile.

     -s      Do not echo any commands as they are executed.  Equivalent to
             specifying `@' before each command line in the makefile.

     -T tracefile
             When used with the -j flag, append a trace record to tracefile
             for each job started and completed.

     -t      Rather than re-building a target as specified in the makefile,
             create it or update its modification time to make it appear up-

     -V variable
             Print make's idea of the value of variable, in the global
             context.  Do not build any targets.  Multiple instances of this
             option may be specified; the variables will be printed one per
             line, with a blank line for each null or undefined variable.  If
             variable contains a `$' then the value will be expanded before

     -W      Treat any warnings during makefile parsing as errors.

     -w      Print entering and leaving directory messages, pre and post

     -X      Don't export variables passed on the command line to the
             environment individually.  Variables passed on the command line
             are still exported via the MAKEFLAGS environment variable.  This
             option may be useful on systems which have a small limit on the
             size of command arguments.

             Set the value of the variable variable to value.  Normally, all
             values passed on the command line are also exported to sub-makes
             in the environment.  The -X flag disables this behavior.
             Variable assignments should follow options for POSIX
             compatibility but no ordering is enforced.

     There are seven different types of lines in a makefile: file dependency
     specifications, shell commands, variable assignments, include statements,
     conditional directives, for loops, and comments.

     In general, lines may be continued from one line to the next by ending
     them with a backslash (`\').  The trailing newline character and initial
     whitespace on the following line are compressed into a single space.

     Dependency lines consist of one or more targets, an operator, and zero or
     more sources.  This creates a relationship where the targets ``depend''
     on the sources and are usually created from them.  The exact relationship
     between the target and the source is determined by the operator that
     separates them.  The three operators are as follows:

     :     A target is considered out-of-date if its modification time is less
           than those of any of its sources.  Sources for a target accumulate
           over dependency lines when this operator is used.  The target is
           removed if make is interrupted.

     !     Targets are always re-created, but not until all sources have been
           examined and re-created as necessary.  Sources for a target
           accumulate over dependency lines when this operator is used.  The
           target is removed if make is interrupted.

     ::    If no sources are specified, the target is always re-created.
           Otherwise, a target is considered out-of-date if any of its sources
           has been modified more recently than the target.  Sources for a
           target do not accumulate over dependency lines when this operator
           is used.  The target will not be removed if make is interrupted.

     Targets and sources may contain the shell wildcard values `?', `*', `[]',
     and `{}'.  The values `?', `*', and `[]' may only be used as part of the
     final component of the target or source, and must be used to describe
     existing files.  The value `{}' need not necessarily be used to describe
     existing files.  Expansion is in directory order, not alphabetically as
     done in the shell.

     Each target may have associated with it one or more lines of shell
     commands, normally used to create the target.  Each of the lines in this
     script must be preceded by a tab.  (For historical reasons, spaces are
     not accepted.)  While targets can appear in many dependency lines if
     desired, by default only one of these rules may be followed by a creation
     script.  If the `::' operator is used, however, all rules may include
     scripts and the scripts are executed in the order found.

     Each line is treated as a separate shell command, unless the end of line
     is escaped with a backslash (`\') in which case that line and the next
     are combined.  If the first characters of the command are any combination
     of `@', `+', or `-', the command is treated specially.  A `@' causes the
     command not to be echoed before it is executed.  A `+' causes the command
     to be executed even when -n is given.  This is similar to the effect of
     the .MAKE special source, except that the effect can be limited to a
     single line of a script.  A `-' in compatibility mode causes any non-zero
     exit status of the command line to be ignored.

     When make is run in jobs mode with -j max_jobs, the entire script for the
     target is fed to a single instance of the shell.  In compatibility (non-
     jobs) mode, each command is run in a separate process.  If the command
     contains any shell meta characters (`#=|^(){};&<>*?[]:$`\\n') it will be
     passed to the shell; otherwise make will attempt direct execution.  If a
     line starts with `-' and the shell has ErrCtl enabled then failure of the
     command line will be ignored as in compatibility mode.  Otherwise `-'
     affects the entire job; the script will stop at the first command line
     that fails, but the target will not be deemed to have failed.

     Makefiles should be written so that the mode of make operation does not
     change their behavior.  For example, any command which needs to use
     ``cd'' or ``chdir'' without potentially changing the directory for
     subsequent commands should be put in parentheses so it executes in a
     subshell.  To force the use of one shell, escape the line breaks so as to
     make the whole script one command.  For example:

                   @echo Building $@ in `pwd`
                   @(cd ${.CURDIR} && ${MAKE} $@)
                   @echo Back in `pwd`

                   @echo Building $@ in `pwd`; \
                   (cd ${.CURDIR} && ${MAKE} $@); \
                   echo Back in `pwd`

     Since make will chdir(2) to `.OBJDIR' before executing any targets, each
     child process starts with that as its current working directory.

     Variables in make are much like variables in the shell, and, by
     tradition, consist of all upper-case letters.

   Variable assignment modifiers
     The five operators that can be used to assign values to variables are as

     =       Assign the value to the variable.  Any previous value is

     +=      Append the value to the current value of the variable.

     ?=      Assign the value to the variable if it is not already defined.

     :=      Assign with expansion, i.e. expand the value before assigning it
             to the variable.  Normally, expansion is not done until the
             variable is referenced.  NOTE: References to undefined variables
             are not expanded.  This can cause problems when variable
             modifiers are used.

     !=      Expand the value and pass it to the shell for execution and
             assign the result to the variable.  Any newlines in the result
             are replaced with spaces.

     Any white-space before the assigned value is removed; if the value is
     being appended, a single space is inserted between the previous contents
     of the variable and the appended value.

     Variables are expanded by surrounding the variable name with either curly
     braces (`{}') or parentheses (`()') and preceding it with a dollar sign
     (`$').  If the variable name contains only a single letter, the
     surrounding braces or parentheses are not required.  This shorter form is
     not recommended.

     If the variable name contains a dollar, then the name itself is expanded
     first.  This allows almost arbitrary variable names, however names
     containing dollar, braces, parenthesis, or whitespace are really best

     If the result of expanding a variable contains a dollar sign (`$') the
     string is expanded again.

     Variable substitution occurs at three distinct times, depending on where
     the variable is being used.

     1.   Variables in dependency lines are expanded as the line is read.

     2.   Variables in shell commands are expanded when the shell command is

     3.   ``.for'' loop index variables are expanded on each loop iteration.
          Note that other variables are not expanded inside loops so the
          following example code:

                .for i in 1 2 3
                a+=     ${i}
                j=      ${i}
                b+=     ${j}

                        @echo ${a}
                        @echo ${b}

          will print:

                1 2 3
                3 3 3

          Because while ${a} contains ``1 2 3'' after the loop is executed,
          ${b} contains ``${j} ${j} ${j}'' which expands to ``3 3 3'' since
          after the loop completes ${j} contains ``3''.

   Variable classes
     The four different classes of variables (in order of increasing
     precedence) are:

     Environment variables
             Variables defined as part of make's environment.

     Global variables
             Variables defined in the makefile or in included makefiles.

     Command line variables
             Variables defined as part of the command line.

     Local variables
             Variables that are defined specific to a certain target.

     Local variables are all built in and their values vary magically from
     target to target.  It is not currently possible to define new local
     variables.  The seven local variables are as follows:

           .ALLSRC   The list of all sources for this target; also known as

           .ARCHIVE  The name of the archive file; also known as `!'.

           .IMPSRC   In suffix-transformation rules, the name/path of the
                     source from which the target is to be transformed (the
                     ``implied'' source); also known as `_'.  It is not
                     defined in explicit rules.

           .MEMBER   The name of the archive member; also known as `%'.

           .OODATE   The list of sources for this target that were deemed out-
                     of-date; also known as `?'.

           .PREFIX   The file prefix of the target, containing only the file
                     portion, no suffix or preceding directory components;
                     also known as `*'.  The suffix must be one of the known
                     suffixes declared with .SUFFIXES or it will not be

           .TARGET   The name of the target; also known as `@'.  For
                     compatibility with other makes this is an alias for
                     .ARCHIVE in archive member rules.

     The shorter forms (`_', `!', `_', `%', `?', `*', and `@') are permitted
     for backward compatibility with historical makefiles and legacy POSIX
     make and are not recommended.

     Variants of these variables with the punctuation followed immediately by
     `D' or `F', e.g.  `$(@D)', are legacy forms equivalent to using the `:H'
     and `:T' modifiers.  These forms are accepted for compatibility with AT&T
     System V UNIX makefiles and POSIX but are not recommended.

     Four of the local variables may be used in sources on dependency lines
     because they expand to the proper value for each target on the line.
     These variables are `.TARGET', `.PREFIX', `.ARCHIVE', and `.MEMBER'.

   Additional built-in variables
     In addition, make sets or knows about the following variables:

     $               A single dollar sign `$', i.e.  `$$' expands to a single
                     dollar sign.

     .ALLTARGETS     The list of all targets encountered in the Makefile.  If
                     evaluated during Makefile parsing, lists only those
                     targets encountered thus far.

     .CURDIR         A path to the directory where make was executed.  Refer
                     to the description of `PWD' for more details.

                     The directory of the file this Makefile was included

                     The filename of the file this Makefile was included from.

     MAKE            The name that make was executed with (argv[0]).  For
                     compatibility make also sets .MAKE with the same value.
                     The preferred variable to use is the environment variable
                     MAKE because it is more compatible with other versions of
                     make and cannot be confused with the special target with
                     the same name.

                     Tells make whether to pass the descriptors of the job
                     token queue even if the target is not tagged with .MAKE
                     The default is `yes' for backwards compatability with
                     FreeBSD 9.0 and earlier.

                     Names the makefile (default `.depend') from which
                     generated dependencies are read.

                     A boolean that controls the default behavior of the -V

     .MAKE.EXPORTED  The list of variables exported by make.

     .MAKE.JOBS      The argument to the -j option.

                     If make is run with j then output for each target is
                     prefixed with a token `--- target ---' the first part of
                     which can be controlled via .MAKE.JOB.PREFIX.  If
                     .MAKE.JOB.PREFIX is empty, no token is printed.
                     For example:
                     would produce tokens like `---make[1234] target ---'
                     making it easier to track the degree of parallelism being

     MAKEFLAGS       The environment variable `MAKEFLAGS' may contain anything
                     that may be specified on make's command line.  Anything
                     specified on make's command line is appended to the
                     `MAKEFLAGS' variable which is then entered into the
                     environment for all programs which make executes.

     .MAKE.LEVEL     The recursion depth of make.  The initial instance of
                     make will be 0, and an incremented value is put into the
                     environment to be seen by the next generation.  This
                     allows tests like: .if ${.MAKE.LEVEL} == 0 to protect
                     things which should only be evaluated in the initial
                     instance of make.

                     The ordered list of makefile names (default `makefile',
                     `Makefile') that make will look for.

                     The list of makefiles read by make, which is useful for
                     tracking dependencies.  Each makefile is recorded only
                     once, regardless of the number of times read.

     .MAKE.MODE      Processed after reading all makefiles.  Can affect the
                     mode that make runs in.  It can contain a number of

                     compat               Like -B, puts make into "compat"

                     meta                 Puts make into "meta" mode, where
                                          meta files are created for each
                                          target to capture the command run,
                                          the output generated and if
                                          filemon(4) is available, the system
                                          calls which are of interest to make.
                                          The captured output can be very
                                          useful when diagnosing errors.

                     curdirOk= bf         Normally make will not create .meta
                                          files in `.CURDIR'.  This can be
                                          overridden by setting bf to a value
                                          which represents True.

                     missing-meta= bf     If bf is True, then a missing .meta
                                          file makes the target out-of-date.

                     missing-filemon= bf  If bf is True, then missing filemon
                                          data makes the target out-of-date.

                     nofilemon            Do not use filemon(4).

                     env                  For debugging, it can be useful to
                                          include the environment in the .meta

                     verbose              If in "meta" mode, print a clue
                                          about the target being built.  This
                                          is useful if the build is otherwise
                                          running silently.  The message
                                          printed the value of:

                     ignore-cmd           Some makefiles have commands which
                                          are simply not stable.  This keyword
                                          causes them to be ignored for
                                          determining whether a target is out
                                          of date in "meta" mode.  See also

                     silent= bf           If bf is True, when a .meta file is
                                          created, mark the target .SILENT.

                     In "meta" mode, provides a list of prefixes which match
                     the directories controlled by make.  If a file that was
                     generated outside of .OBJDIR but within said bailiwick is
                     missing, the current target is considered out-of-date.

                     In "meta" mode, this variable contains a list of all the
                     meta files updated.  If not empty, it can be used to
                     trigger processing of .MAKE.META.FILES.

                     In "meta" mode, this variable contains a list of all the
                     meta files used (updated or not).  This list can be used
                     to process the meta files to extract dependency

                     Provides a list of path prefixes that should be ignored;
                     because the contents are expected to change over time.
                     The default list includes: `/dev /etc /proc /tmp /var/run

                     Provides a list of patterns to match against pathnames.
                     Ignore any that match.

                     Defines the message printed for each meta file updated in
                     "meta verbose" mode.  The default value is:
                           Building ${.TARGET:H:tA}/${.TARGET:T}

     .MAKEOVERRIDES  This variable is used to record the names of variables
                     assigned to on the command line, so that they may be
                     exported as part of `MAKEFLAGS'.  This behavior can be
                     disabled by assigning an empty value to `.MAKEOVERRIDES'
                     within a makefile.  Extra variables can be exported from
                     a makefile by appending their names to `.MAKEOVERRIDES'.
                     `MAKEFLAGS' is re-exported whenever `.MAKEOVERRIDES' is

                     If make was built with filemon(4) support, this is set to
                     the path of the device node.  This allows makefiles to
                     test for this support.

     .MAKE.PID       The process-id of make.

     .MAKE.PPID      The parent process-id of make.

                     value should be a boolean that controls whether `$$' are
                     preserved when doing `:=' assignments.  The default is
                     false, for backwards compatibility.  Set to true for
                     compatability with other makes.  If set to false, `$$'
                     becomes `$' per normal evaluation rules.

                     When make stops due to an error, it prints its name and
                     the value of `.CURDIR' as well as the value of any
                     variables named in `MAKE_PRINT_VAR_ON_ERROR'.

     .newline        This variable is simply assigned a newline character as
                     its value.  This allows expansions using the :@ modifier
                     to put a newline between iterations of the loop rather
                     than a space.  For example, the printing of
                     `MAKE_PRINT_VAR_ON_ERROR' could be done as

     .OBJDIR         A path to the directory where the targets are built.  Its
                     value is determined by trying to chdir(2) to the
                     following directories in order and using the first match:

                     1.   ${MAKEOBJDIRPREFIX}${.CURDIR}

                          (Only if `MAKEOBJDIRPREFIX' is set in the
                          environment or on the command line.)

                     2.   ${MAKEOBJDIR}

                          (Only if `MAKEOBJDIR' is set in the environment or
                          on the command line.)

                     3.   ${.CURDIR}/obj.${MACHINE}

                     4.   ${.CURDIR}/obj

                     5.   /usr/obj/${.CURDIR}

                     6.   ${.CURDIR}

                     Variable expansion is performed on the value before it's
                     used, so expressions such as
                     may be used.  This is especially useful with

                     `.OBJDIR' may be modified in the makefile via the special
                     target `.OBJDIR'.  In all cases, make will chdir(2) to
                     the specified directory if it exists, and set `.OBJDIR'
                     and `PWD' to that directory before executing any targets.

     .PARSEDIR       A path to the directory of the current `Makefile' being

     .PARSEFILE      The basename of the current `Makefile' being parsed.
                     This variable and `.PARSEDIR' are both set only while the
                     `Makefiles' are being parsed.  If you want to retain
                     their current values, assign them to a variable using
                     assignment with expansion: (`:=').

     .PATH           A variable that represents the list of directories that
                     make will search for files.  The search list should be
                     updated using the target `.PATH' rather than the

     PWD             Alternate path to the current directory.  make normally
                     sets `.CURDIR' to the canonical path given by getcwd(3).
                     However, if the environment variable `PWD' is set and
                     gives a path to the current directory, then make sets
                     `.CURDIR' to the value of `PWD' instead.  This behavior
                     is disabled if `MAKEOBJDIRPREFIX' is set or `MAKEOBJDIR'
                     contains a variable transform.  `PWD' is set to the value
                     of `.OBJDIR' for all programs which make executes.

     .TARGETS        The list of targets explicitly specified on the command
                     line, if any.

     VPATH           Colon-separated (``:'') lists of directories that make
                     will search for files.  The variable is supported for
                     compatibility with old make programs only, use `.PATH'

   Variable modifiers
     Variable expansion may be modified to select or modify each word of the
     variable (where a ``word'' is white-space delimited sequence of
     characters).  The general format of a variable expansion is as follows:


     Each modifier begins with a colon, which may be escaped with a backslash

     A set of modifiers can be specified via a variable, as follows:


     In this case the first modifier in the modifier_variable does not start
     with a colon, since that must appear in the referencing variable.  If any
     of the modifiers in the modifier_variable contain a dollar sign (`$'),
     these must be doubled to avoid early expansion.

     The supported modifiers are:

     :E   Replaces each word in the variable with its suffix.

     :H   Replaces each word in the variable with everything but the last

          Select only those words that match pattern.  The standard shell
          wildcard characters (`*', `?', and `[]') may be used.  The wildcard
          characters may be escaped with a backslash (`\').  As a consequence
          of the way values are split into words, matched, and then joined, a
          construct like
          will normalize the inter-word spacing, removing all leading and
          trailing space, and converting multiple consecutive spaces to single

          This is identical to `:M', but selects all words which do not match

     :O   Order every word in variable alphabetically.  To sort words in
          reverse order use the `:O:[-1..1]' combination of modifiers.

     :Ox  Randomize words in variable.  The results will be different each
          time you are referring to the modified variable; use the assignment
          with expansion (`:=') to prevent such behavior.  For example,

                LIST=                   uno due tre quattro
                RANDOM_LIST=            ${LIST:Ox}
                STATIC_RANDOM_LIST:=    ${LIST:Ox}

                        @echo "${RANDOM_LIST}"
                        @echo "${RANDOM_LIST}"
                        @echo "${STATIC_RANDOM_LIST}"
                        @echo "${STATIC_RANDOM_LIST}"
          may produce output similar to:

                quattro due tre uno
                tre due quattro uno
                due uno quattro tre
                due uno quattro tre

     :Q   Quotes every shell meta-character in the variable, so that it can be
          passed safely through recursive invocations of make.

     :R   Replaces each word in the variable with everything but its suffix.

          The value is a format string for strftime(3), using the current

          Compute a 32-bit hash of the value and encode it as hex digits.

          The value is a format string for strftime(3), using the current

     :tA  Attempt to convert variable to an absolute path using realpath(3),
          if that fails, the value is unchanged.

     :tl  Converts variable to lower-case letters.

          Words in the variable are normally separated by a space on
          expansion.  This modifier sets the separator to the character c.  If
          c is omitted, then no separator is used.  The common escapes
          (including octal numeric codes), work as expected.

     :tu  Converts variable to upper-case letters.

     :tW  Causes the value to be treated as a single word (possibly containing
          embedded white space).  See also `:[*]'.

     :tw  Causes the value to be treated as a sequence of words delimited by
          white space.  See also `:[@]'.

          Modify the first occurrence of old_string in the variable's value,
          replacing it with new_string.  If a `g' is appended to the last
          slash of the pattern, all occurrences in each word are replaced.  If
          a `1' is appended to the last slash of the pattern, only the first
          word is affected.  If a `W' is appended to the last slash of the
          pattern, then the value is treated as a single word (possibly
          containing embedded white space).  If old_string begins with a caret
          (`^'), old_string is anchored at the beginning of each word.  If
          old_string ends with a dollar sign (`$'), it is anchored at the end
          of each word.  Inside new_string, an ampersand (`&') is replaced by
          old_string (without any `^' or `$').  Any character may be used as a
          delimiter for the parts of the modifier string.  The anchoring,
          ampersand and delimiter characters may be escaped with a backslash

          Variable expansion occurs in the normal fashion inside both
          old_string and new_string with the single exception that a backslash
          is used to prevent the expansion of a dollar sign (`$'), not a
          preceding dollar sign as is usual.

          The :C modifier is just like the :S modifier except that the old and
          new strings, instead of being simple strings, are an extended
          regular expression (see regex(3)) string pattern and an ed(1)-style
          string replacement.  Normally, the first occurrence of the pattern
          pattern in each word of the value is substituted with replacement.
          The `1' modifier causes the substitution to apply to at most one
          word; the `g' modifier causes the substitution to apply to as many
          instances of the search pattern pattern as occur in the word or
          words it is found in; the `W' modifier causes the value to be
          treated as a single word (possibly containing embedded white space).
          Note that `1' and `g' are orthogonal; the former specifies whether
          multiple words are potentially affected, the latter whether multiple
          substitutions can potentially occur within each affected word.

          As for the :S modifier, the pattern and replacement are subjected to
          variable expansion before being parsed as regular expressions.

     :T   Replaces each word in the variable with its last component.

     :u   Remove adjacent duplicate words (like uniq(1)).

          If the variable name (not its value), when parsed as a .if
          conditional expression, evaluates to true, return as its value the
          true_string, otherwise return the false_string.  Since the variable
          name is used as the expression, :? must be the first modifier after
          the variable name itself - which will, of course, usually contain
          variable expansions.  A common error is trying to use expressions
          which actually tests defined(NUMBERS), to determine is any words
          match "42" you need to use something like:
                ${"${NUMBERS:M42}" != "":?match:no}.

          This is the AT&T System V UNIX style variable substitution.  It must
          be the last modifier specified.  If old_string or new_string do not
          contain the pattern matching character % then it is assumed that
          they are anchored at the end of each word, so only suffixes or
          entire words may be replaced.  Otherwise % is the substring of
          old_string to be replaced in new_string.

          Variable expansion occurs in the normal fashion inside both
          old_string and new_string with the single exception that a backslash
          is used to prevent the expansion of a dollar sign (`$'), not a
          preceding dollar sign as is usual.

          This is the loop expansion mechanism from the OSF Development
          Environment (ODE) make.  Unlike .for loops expansion occurs at the
          time of reference.  Assign temp to each word in the variable and
          evaluate string.  The ODE convention is that temp should start and
          end with a period.  For example.
                ${LINKS:@.LINK.@${LN} ${TARGET} ${.LINK.}@}

          However a single character variable is often more readable:

          If the variable is undefined newval is the value.  If the variable
          is defined, the existing value is returned.  This is another ODE
          make feature.  It is handy for setting per-target CFLAGS for
          If a value is only required if the variable is undefined, use:

          If the variable is defined newval is the value.

     :L   The name of the variable is the value.

     :P   The path of the node which has the same name as the variable is the
          value.  If no such node exists or its path is null, then the name of
          the variable is used.  In order for this modifier to work, the name
          (node) must at least have appeared on the rhs of a dependency.

          The output of running cmd is the value.

     :sh  If the variable is non-empty it is run as a command and the output
          becomes the new value.

          The variable is assigned the value str after substitution.  This
          modifier and its variations are useful in obscure situations such as
          wanting to set a variable when shell commands are being parsed.
          These assignment modifiers always expand to nothing, so if appearing
          in a rule line by themselves should be preceded with something to
          keep make happy.

          The `::' helps avoid false matches with the AT&T System V UNIX style
          := modifier and since substitution always occurs the ::= form is
          vaguely appropriate.

          As for ::= but only if the variable does not already have a value.

          Append str to the variable.

          Assign the output of cmd to the variable.

          Selects one or more words from the value, or performs other
          operations related to the way in which the value is divided into

          Ordinarily, a value is treated as a sequence of words delimited by
          white space.  Some modifiers suppress this behavior, causing a value
          to be treated as a single word (possibly containing embedded white
          space).  An empty value, or a value that consists entirely of white-
          space, is treated as a single word.  For the purposes of the `:[]'
          modifier, the words are indexed both forwards using positive
          integers (where index 1 represents the first word), and backwards
          using negative integers (where index -1 represents the last word).

          The range is subjected to variable expansion, and the expanded
          result is then interpreted as follows:

          index  Selects a single word from the value.

                 Selects all words from start to end, inclusive.  For example,
                 `:[2..-1]' selects all words from the second word to the last
                 word.  If start is greater than end, then the words are
                 output in reverse order.  For example, `:[-1..1]' selects all
                 the words from last to first.

          *      Causes subsequent modifiers to treat the value as a single
                 word (possibly containing embedded white space).  Analogous
                 to the effect of "$*" in Bourne shell.

          0      Means the same as `:[*]'.

          @      Causes subsequent modifiers to treat the value as a sequence
                 of words delimited by white space.  Analogous to the effect
                 of "$@" in Bourne shell.

          #      Returns the number of words in the value.

     Makefile inclusion, conditional structures and for loops  reminiscent of
     the C programming language are provided in make.  All such structures are
     identified by a line beginning with a single dot (`.') character.  Files
     are included with either .include <file> or .include "file".  Variables
     between the angle brackets or double quotes are expanded to form the file
     name.  If angle brackets are used, the included makefile is expected to
     be in the system makefile directory.  If double quotes are used, the
     including makefile's directory and any directories specified using the -I
     option are searched before the system makefile directory.  For
     compatibility with other versions of make `include file ...' is also

     If the include statement is written as .-include or as .sinclude then
     errors locating and/or opening include files are ignored.

     If the include statement is written as .dinclude not only are errors
     locating and/or opening include files ignored, but stale dependencies
     within the included file will be ignored just like .MAKE.DEPENDFILE.

     Conditional expressions are also preceded by a single dot as the first
     character of a line.  The possible conditionals are as follows:

     .error message
             The message is printed along with the name of the makefile and
             line number, then make will exit.

     .export variable ...
             Export the specified global variable.  If no variable list is
             provided, all globals are exported except for internal variables
             (those that start with `.').  This is not affected by the -X
             flag, so should be used with caution.  For compatibility with
             other make programs `export variable=value' is also accepted.

             Appending a variable name to .MAKE.EXPORTED is equivalent to
             exporting a variable.

     .export-env variable ...
             The same as `.export', except that the variable is not appended
             to .MAKE.EXPORTED.  This allows exporting a value to the
             environment which is different from that used by make internally.

     .export-literal variable ...
             The same as `.export-env', except that variables in the value are
             not expanded.

     .info message
             The message is printed along with the name of the makefile and
             line number.

     .undef variable
             Un-define the specified global variable.  Only global variables
             may be un-defined.

     .unexport variable ...
             The opposite of `.export'.  The specified global variable will be
             removed from .MAKE.EXPORTED.  If no variable list is provided,
             all globals are unexported, and .MAKE.EXPORTED deleted.

             Unexport all globals previously exported and clear the
             environment inherited from the parent.  This operation will cause
             a memory leak of the original environment, so should be used
             sparingly.  Testing for .MAKE.LEVEL being 0, would make sense.
             Also note that any variables which originated in the parent
             environment should be explicitly preserved if desired.  For

                   .if ${.MAKE.LEVEL} == 0
                   PATH := ${PATH}
                   .export PATH

             Would result in an environment containing only `PATH', which is
             the minimal useful environment.  Actually `.MAKE.LEVEL' will also
             be pushed into the new environment.

     .warning message
             The message prefixed by `warning:' is printed along with the name
             of the makefile and line number.

     .if [!]expression [operator expression ...]
             Test the value of an expression.

     .ifdef [!]variable [operator variable ...]
             Test the value of a variable.

     .ifndef [!]variable [operator variable ...]
             Test the value of a variable.

     .ifmake [!]target [operator target ...]
             Test the target being built.

     .ifnmake [!] target [operator target ...]
             Test the target being built.

     .else   Reverse the sense of the last conditional.

     .elif [!] expression [operator expression ...]
             A combination of `.else' followed by `.if'.

     .elifdef [!]variable [operator variable ...]
             A combination of `.else' followed by `.ifdef'.

     .elifndef [!]variable [operator variable ...]
             A combination of `.else' followed by `.ifndef'.

     .elifmake [!]target [operator target ...]
             A combination of `.else' followed by `.ifmake'.

     .elifnmake [!]target [operator target ...]
             A combination of `.else' followed by `.ifnmake'.

     .endif  End the body of the conditional.

     The operator may be any one of the following:

     ||     Logical OR.

     &&     Logical AND; of higher precedence than ``||''.

     As in C, make will only evaluate a conditional as far as is necessary to
     determine its value.  Parentheses may be used to change the order of
     evaluation.  The boolean operator `!' may be used to logically negate an
     entire conditional.  It is of higher precedence than `&&'.

     The value of expression may be any of the following:

     defined  Takes a variable name as an argument and evaluates to true if
              the variable has been defined.

     make     Takes a target name as an argument and evaluates to true if the
              target was specified as part of make's command line or was
              declared the default target (either implicitly or explicitly,
              see .MAIN) before the line containing the conditional.

     empty    Takes a variable, with possible modifiers, and evaluates to true
              if the expansion of the variable would result in an empty

     exists   Takes a file name as an argument and evaluates to true if the
              file exists.  The file is searched for on the system search path
              (see .PATH).

     target   Takes a target name as an argument and evaluates to true if the
              target has been defined.

              Takes a target name as an argument and evaluates to true if the
              target has been defined and has commands associated with it.

     Expression may also be an arithmetic or string comparison.  Variable
     expansion is performed on both sides of the comparison, after which the
     integral values are compared.  A value is interpreted as hexadecimal if
     it is preceded by 0x, otherwise it is decimal; octal numbers are not
     supported.  The standard C relational operators are all supported.  If
     after variable expansion, either the left or right hand side of a `==' or
     `!=' operator is not an integral value, then string comparison is
     performed between the expanded variables.  If no relational operator is
     given, it is assumed that the expanded variable is being compared against
     0 or an empty string in the case of a string comparison.

     When make is evaluating one of these conditional expressions, and it
     encounters a (white-space separated) word it doesn't recognize, either
     the ``make'' or ``defined'' expression is applied to it, depending on the
     form of the conditional.  If the form is `.ifdef', `.ifndef', or `.if'
     the ``defined'' expression is applied.  Similarly, if the form is
     `.ifmake' or `.ifnmake, the' ``make'' expression is applied.

     If the conditional evaluates to true the parsing of the makefile
     continues as before.  If it evaluates to false, the following lines are
     skipped.  In both cases this continues until a `.else' or `.endif' is

     For loops are typically used to apply a set of rules to a list of files.
     The syntax of a for loop is:

     .for variable [variable ...] in expression

     After the for expression is evaluated, it is split into words.  On each
     iteration of the loop, one word is taken and assigned to each variable,
     in order, and these variables are substituted into the make-rules inside
     the body of the for loop.  The number of words must come out even; that
     is, if there are three iteration variables, the number of words provided
     must be a multiple of three.

     Comments begin with a hash (`#') character, anywhere but in a shell
     command line, and continue to the end of an unescaped new line.

     .EXEC     Target is never out of date, but always execute commands

     .IGNORE   Ignore any errors from the commands associated with this
               target, exactly as if they all were preceded by a dash (`-').

     .MADE     Mark all sources of this target as being up-to-date.

     .MAKE     Execute the commands associated with this target even if the -n
               or -t options were specified.  Normally used to mark recursive

     .META     Create a meta file for the target, even if it is flagged as
               .PHONY, .MAKE, or .SPECIAL.  Usage in conjunction with .MAKE is
               the most likely case.  In "meta" mode, the target is out-of-
               date if the meta file is missing.

     .NOMETA   Do not create a meta file for the target.  Meta files are also
               not created for .PHONY, .MAKE, or .SPECIAL targets.

               Ignore differences in commands when deciding if target is out
               of date.  This is useful if the command contains a value which
               always changes.  If the number of commands change, though, the
               target will still be out of date.  The same effect applies to
               any command line that uses the variable .OODATE, which can be
               used for that purpose even when not otherwise needed or

                             @echo this will be compared
                             @echo this will not ${.OODATE:M.NOMETA_CMP}
                             @echo this will also be compared

               The :M pattern suppresses any expansion of the unwanted

     .NOPATH   Do not search for the target in the directories specified by

     .NOTMAIN  Normally make selects the first target it encounters as the
               default target to be built if no target was specified.  This
               source prevents this target from being selected.

               If a target is marked with this attribute and make can't figure
               out how to create it, it will ignore this fact and assume the
               file isn't needed or already exists.

     .PHONY    The target does not correspond to an actual file; it is always
               considered to be out of date, and will not be created with the
               -t option.  Suffix-transformation rules are not applied to
               .PHONY targets.

               When make is interrupted, it normally removes any partially
               made targets.  This source prevents the target from being

               Synonym for .MAKE.

     .SILENT   Do not echo any of the commands associated with this target,
               exactly as if they all were preceded by an at sign (`@').

     .USE      Turn the target into make's version of a macro.  When the
               target is used as a source for another target, the other target
               acquires the commands, sources, and attributes (except for
               .USE) of the source.  If the target already has commands, the
               .USE target's commands are appended to them.

               Exactly like .USE, but prepend the .USEBEFORE target commands
               to the target.

     .WAIT     If .WAIT appears in a dependency line, the sources that precede
               it are made before the sources that succeed it in the line.
               Since the dependents of files are not made until the file
               itself could be made, this also stops the dependents being
               built unless they are needed for another branch of the
               dependency tree.  So given:

               x: a .WAIT b
                       echo x
                       echo a
               b: b1
                       echo b
                       echo b1

               the output is always `a', `b1', `b', `x'.
               The ordering imposed by .WAIT is only relevant for parallel

     Special targets may not be included with other targets, i.e. they must be
     the only target specified.

     .BEGIN   Any command lines attached to this target are executed before
              anything else is done.

              This is sort of a .USE rule for any target (that was used only
              as a source) that make can't figure out any other way to create.
              Only the shell script is used.  The .IMPSRC variable of a target
              that inherits .DEFAULT's commands is set to the target's own

     .END     Any command lines attached to this target are executed after
              everything else is done.

     .ERROR   Any command lines attached to this target are executed when
              another target fails.  The .ERROR_TARGET variable is set to the
              target that failed.  See also MAKE_PRINT_VAR_ON_ERROR.

     .IGNORE  Mark each of the sources with the .IGNORE attribute.  If no
              sources are specified, this is the equivalent of specifying the
              -i option.

              If make is interrupted, the commands for this target will be

     .MAIN    If no target is specified when make is invoked, this target will
              be built.

              This target provides a way to specify flags for make when the
              makefile is used.  The flags are as if typed to the shell,
              though the -f option will have no effect.

     .NOPATH  Apply the .NOPATH attribute to any specified sources.

              Disable parallel mode.

              Synonym for .NOTPARALLEL, for compatibility with other pmake

     .OBJDIR  The source is a new value for `.OBJDIR'.  If it exists, make
              will chdir(2) to it and update the value of `.OBJDIR'.

     .ORDER   The named targets are made in sequence.  This ordering does not
              add targets to the list of targets to be made.  Since the
              dependents of a target do not get built until the target itself
              could be built, unless `a' is built by another part of the
              dependency graph, the following is a dependency loop:

              .ORDER: b a
              b: a

              The ordering imposed by .ORDER is only relevant for parallel

     .PATH    The sources are directories which are to be searched for files
              not found in the current directory.  If no sources are
              specified, any previously specified directories are deleted.  If
              the source is the special .DOTLAST target, then the current
              working directory is searched last.

              Like .PATH but applies only to files with a particular suffix.
              The suffix must have been previously declared with .SUFFIXES.

     .PHONY   Apply the .PHONY attribute to any specified sources.

              Apply the .PRECIOUS attribute to any specified sources.  If no
              sources are specified, the .PRECIOUS attribute is applied to
              every target in the file.

     .SHELL   Sets the shell that make will use to execute commands.  The
              sources are a set of field=value pairs.

              name        This is the minimal specification, used to select
                          one of the built-in shell specs; sh, ksh, and csh.

              path        Specifies the path to the shell.

              hasErrCtl   Indicates whether the shell supports exit on error.

              check       The command to turn on error checking.

              ignore      The command to disable error checking.

              echo        The command to turn on echoing of commands executed.

              quiet       The command to turn off echoing of commands

              filter      The output to filter after issuing the quiet
                          command.  It is typically identical to quiet.

              errFlag     The flag to pass the shell to enable error checking.

              echoFlag    The flag to pass the shell to enable command

              newline     The string literal to pass the shell that results in
                          a single newline character when used outside of any
                          quoting characters.

              .SHELL: name=ksh path=/bin/ksh hasErrCtl=true \
                      check="set -e" ignore="set +e" \
                      echo="set -v" quiet="set +v" filter="set +v" \
                      echoFlag=v errFlag=e newline="'\n'"

     .SILENT  Apply the .SILENT attribute to any specified sources.  If no
              sources are specified, the .SILENT attribute is applied to every
              command in the file.

     .STALE   This target gets run when a dependency file contains stale
              entries, having .ALLSRC set to the name of that dependency file.

              Each source specifies a suffix to make.  If no sources are
              specified, any previously specified suffixes are deleted.  It
              allows the creation of suffix-transformation rules.


              .SUFFIXES: .o
                      cc -o ${.TARGET} -c ${.IMPSRC}

     make uses the following environment variables, if they exist: MACHINE,
     PWD, and TMPDIR.

     MAKEOBJDIRPREFIX and MAKEOBJDIR may only be set in the environment or on
     the command line to make and not as makefile variables; see the
     description of `.OBJDIR' for more details.

     .depend        list of dependencies
     Makefile       list of dependencies
     makefile       list of dependencies         system makefile
     /usr/share/mk  system makefile directory

     The basic make syntax is compatible between different versions of make;
     however the special variables, variable modifiers and conditionals are

   Older versions
     An incomplete list of changes in older versions of make:

     The way that .for loop variables are substituted changed after NetBSD 5.0
     so that they still appear to be variable expansions.  In particular this
     stops them being treated as syntax, and removes some obscure problems
     using them in .if statements.

     The way that parallel makes are scheduled changed in NetBSD 4.0 so that
     .ORDER and .WAIT apply recursively to the dependent nodes.  The
     algorithms used may change again in the future.

   Other make dialects
     Other make dialects (GNU make, SVR4 make, POSIX make, etc.) do not
     support most of the features of make as described in this manual.  Most

           +o   The .WAIT and .ORDER declarations and most functionality
               pertaining to parallelization.  (GNU make supports
               parallelization but lacks these features needed to control it

           +o   Directives, including for loops and conditionals and most of
               the forms of include files.  (GNU make has its own incompatible
               and less powerful syntax for conditionals.)

           +o   All built-in variables that begin with a dot.

           +o   Most of the special sources and targets that begin with a dot,
               with the notable exception of .PHONY, .PRECIOUS, and .SUFFIXES.

           +o   Variable modifiers, except for the
               string substitution, which does not portably support globbing
               with `%' and historically only works on declared suffixes.

           +o   The $> variable even in its short form; most makes support this
               functionality but its name varies.

     Some features are somewhat more portable, such as assignment with +=, ?=,
     and !=.  The .PATH functionality is based on an older feature VPATH found
     in GNU make and many versions of SVR4 make; however, historically its
     behavior is too ill-defined (and too buggy) to rely upon.

     The $@ and $< variables are more or less universally portable, as is the
     $(MAKE) variable.  Basic use of suffix rules (for files only in the
     current directory, not trying to chain transformations together, etc.) is
     also reasonably portable.


     A make command appeared in Version 7 AT&T UNIX.  This make implementation
     is based on Adam De Boor's pmake program which was written for Sprite at
     Berkeley.  It was designed to be a parallel distributed make running jobs
     on different machines using a daemon called ``customs''.

     Historically the target/dependency ``FRC'' has been used to FoRCe
     rebuilding (since the target/dependency does not exist... unless someone
     creates an ``FRC'' file).

     The make syntax is difficult to parse without actually acting of the
     data.  For instance finding the end of a variable use should involve
     scanning each the modifiers using the correct terminator for each field.
     In many places make just counts {} and () in order to find the end of a
     variable expansion.

     There is no way of escaping a space character in a filename.

FreeBSD 11.0-PRERELEASE          June 2, 2016          FreeBSD 11.0-PRERELEASE


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