pkg-config  [--modversion] [--help] [--print-errors] [--silence-errors]
       [--cflags] [--libs] [--libs-only-L]  [--libs-only-l]  [--cflags-only-I]
       [--variable=VARIABLENAME]     [--define-variable=VARIABLENAME=VARIABLE-
       VALUE] [--print-variables] [--uninstalled]  [--exists]  [--atleast-ver-
       sion=VERSION]     [--exact-version=VERSION]     [--max-version=VERSION]
       [--list-all]  [LIBRARIES...]    [--print-provides]   [--print-requires]
       [--print-requires-private] [LIBRARIES...]

       The  pkg-config program is used to retrieve information about installed
       libraries in the system.  It is typically  used  to  compile  and  link
       against  one  or more libraries.  Here is a typical usage scenario in a

       program: program.c
            cc program.c $(pkg-config --cflags --libs gnomeui)

       pkg-config retrieves information about packages from  special  metadata
       files.  These  files  are named after the package, and has a .pc exten-
       sion.   On  most  systems,  pkg-config  looks  in   /usr/lib/pkgconfig,
       /usr/share/pkgconfig,            /usr/local/lib/pkgconfig           and
       /usr/local/share/pkgconfig for these files.  It will additionally  look
       in the colon-separated (on Windows, semicolon-separated) list of direc-
       tories specified by the PKG_CONFIG_PATH environment variable.

       The package name specified on the pkg-config command line is defined to
       be the name of the metadata file, minus the .pc extension. If a library
       can install multiple versions simultaneously, it must give each version
       its  own  name (for example, GTK 1.2 might have the package name "gtk+"
       while GTK 2.0 has "gtk+-2.0").

       In addition to specifying a package name on the command line, the  full
       path  to  a  given .pc file may be given instead. This allows a user to
       directly query a particular .pc file.

       The following options are supported:

              Requests that the version information of the libraries specified
              on  the  command  line be displayed.  If pkg-config can find all
              the libraries on the command line, each library's version string
              is  printed  to  stdout, one version per line. In this case pkg-
              config exits successfully. If one or more libraries is  unknown,
              pkg-config exits with a nonzero code, and the contents of stdout
              are undefined.

       --help Displays a help message and terminates.

              If one or more of the modules on  the  command  line,  or  their
              dependencies,  are not found, or if an error occurs in parsing a
              a  .pc  file,  then  this option will keep errors explaining the
              problem from being printed. With  "predicate"  options  such  as
              "--exists"  pkg-config  runs  silently  by default, because it's
              usually used in scripts that want to control what's  output.  So
              this  option  is  only useful with options such as "--cflags" or
              "--modversion"  that  print  errors  by  default.  The  PKG_CON-
              FIG_DEBUG_SPEW environment variable overrides this option.

              If printing errors, print them to stdout rather than the default

       The following options are used to compile and link programs:

              This prints pre-processor and compile flags required to  compile
              the  packages on the command line, including flags for all their
              dependencies. Flags are "compressed" so that each identical flag
              appears  only  once.  pkg-config exits with a nonzero code if it
              can't find metadata for one or more of the packages on the  com-
              mand line.

              This  prints  the -I part of "--cflags". That is, it defines the
              header search path but doesn't specify anything else.

       --libs This option is identical to "--cflags", only it prints the  link
              flags. As with "--cflags", duplicate flags are merged (maintain-
              ing proper ordering), and flags for dependencies are included in
              the output.

              This  prints the -L/-R part of "--libs". That is, it defines the
              library search path but doesn't specify which libraries to  link

              This  prints the -l part of "--libs" for the libraries specified
              on the command line. Note that the union of "--libs-only-l"  and
              "--libs-only-L"  may be smaller than "--libs", due to flags such
              as -rdynamic.

              This returns the value of a variable defined in a package's  .pc
              file.  Most  packages define the variable "prefix", for example,
              so you can say:
                $ pkg-config --variable=prefix glib-2.0

              This sets a global value for a variable, overriding the value in
              any  .pc  files. Most packages define the variable "prefix", for
              example, so you can say:
              packages.  If you specify the "--uninstalled" option, pkg-config
              will return successfully  if  any  "-uninstalled"  packages  are
              being used, and return failure (false) otherwise.  (The PKG_CON-
              FIG_DISABLE_UNINSTALLED environment  variable  keeps  pkg-config
              from  implicitly  choosing  "-uninstalled"  packages, so if that
              variable is set, they will only have been used  if  you  pass  a
              name like "foo-uninstalled" on the command line explicitly.)




              These  options  test  whether the package or list of packages on
              the command line are known to pkg-config, and optionally whether
              the  version  number of a package meets certain constraints.  If
              all packages exist and meet the specified  version  constraints,
              pkg-config  exits  successfully.  Otherwise  it exits unsuccess-

              Rather than using the version-test options, you can simply  give
              a version constraint after each package name, for example:
                $ pkg-config --exists 'glib-2.0 >= 1.3.4 libxml = 1.8.3'
              Remember to use --print-errors if you want error messages.

              This  option  is available only on Windows. It causes pkg-config
              to output -l and -L flags in the form recognized by  the  Micro-
              soft Visual C++ command-line compiler, cl. Specifically, instead
              of -Lx:/some/path it prints /libpath:x/some/path, and instead of
              -lfoo it prints foo.lib. Note that the --libs output consists of
              flags for the linker, and should be placed  on  the  cl  command
              line after a /link switch.

              This option is available only on Windows. It prevents pkg-config
              from automatically trying to override the value of the  variable
              "prefix" in each .pc file.

              Also  this option is available only on Windows. It sets the name
              of the variable that pkg-config automatically sets as  described

              Output  libraries  suitable  for  static  linking.   That  means
              including any private libraries in the output.  This  relies  on
              proper  tagging  in  the  .pc  files, else a too large number of
              libraries will ordinarily be output.

              List all modules found in the pkg-config path.

              A  colon-separated  (on  Windows,  semicolon-separated)  list of
              directories to search for .pc files.  The default directory will
              always  be  searched  after  searching  the path; the default is
              libdir/pkgconfig:datadir/pkgconfig where libdir  is  the  libdir
              for pkg-config and datadir is the datadir for pkg-config when it
              was installed.

              If set, causes pkg-config to print all kinds of debugging infor-
              mation and report all errors.

              A  value to set for the magic variable pc_top_builddir which may
              appear in .pc files. If the environment variable is not set, the
              default  value  '$(top_builddir)'  will  be  used. This variable
              should refer to the top builddir of the Makefile where the  com-
              pile/link  flags reported by pkg-config will be used.  This only
              matters when compiling/linking against a package that hasn't yet
              been installed.

              Normally  if you request the package "foo" and the package "foo-
              uninstalled" exists, pkg-config will prefer  the  "-uninstalled"
              variant.  This  allows  compilation/linking  against uninstalled
              packages.  If this environment variable is set, it disables said

              Don't strip -I/usr/include out of cflags.

              Don't strip -L/usr/lib out of libs

              Modify  -I  and -L to use the directories located in target sys-
              root.  this option is useful when cross-compiling packages  that
              use  pkg-config  to  determine CFLAGS and LDFLAGS. -I and -L are
              modified to point to the new system  root.  this  means  that  a
              -I/usr/include/libfoo will become -I/var/target/usr/include/lib-
              foo with a PKG_CONFIG_SYSROOT_DIR  equal  to  /var/target  (same
              rule apply to -L)

              Replaces   the  default  pkg-config  search  directory,  usually

       pkg-config can be used to query itself for  the  default  search  path,
       version number and other information, for instance using:
         $ pkg-config --variable pc_path pkg-config
         $ pkg-config --modversion pkg-config


              The macro PKG_CHECK_MODULES can be used in to check
              whether modules exist. A typical usage would be:
               PKG_CHECK_MODULES([MYSTUFF], [gtk+-2.0 >= 1.3.5 libxml = 1.8.4])

              This  would  result in MYSTUFF_LIBS and MYSTUFF_CFLAGS substitu-
              tion variables, set to the libs and cflags for the given  module
              list.   If  a  module  is  missing  or has the wrong version, by
              default configure will abort with  a  message.  To  replace  the
              default      action,     specify     an     ACTION-IF-NOT-FOUND.
              PKG_CHECK_MODULES will not print any error messages if you spec-
              ify  your  own  ACTION-IF-NOT-FOUND.   However,  it will set the
              variable MYSTUFF_PKG_ERRORS, which you can use to  display  what
              went wrong.

              Note   that  if  there  is  a  possibility  the  first  call  to
              PKG_CHECK_MODULES might  not  happen,  you  should  be  sure  to
              include  an explicit call to PKG_PROG_PKG_CONFIG in your config-


              Defines the PKG_CONFIG variable to the  best  pkg-config  avail-
              able,  useful  if  you  need  pkg-config  but  don't want to use


              Check to see whether a particular set of modules exists.   Simi-
              lar  to PKG_CHECK_MODULES(), but does not set variables or print

              Similar to PKG_CHECK_MODULES, make sure that the first  instance
              of  this  or  PKG_CHECK_MODULES  is called, or make sure to call
              PKG_CHECK_EXISTS manually.

       To add a library to the set of packages pkg-config knows about,  simply
       install a .pc file. You should install this file to libdir/pkgconfig.

       Here is an example file:
       # This is a comment
       prefix=/home/hp/unst   # this defines a variable
       exec_prefix=${prefix}  # defining another variable in terms of the first

       Name: GObject                            # human-readable name
       Description: Object/type system for GLib # human-readable description
       Version: 1.3.1
       Files have two kinds of line: keyword lines start with a keyword plus a
       colon, and variable definitions start with an alphanumeric string  plus
       an  equals sign. Keywords are defined in advance and have special mean-
       ing to pkg-config; variables do not, you can have  any  variables  that
       you  wish  (however,  users  may expect to retrieve the usual directory
       name variables).

       Note that variable references are written "${foo}"; you can escape lit-
       eral "${" as "$${".

       Name:  This field should be a human-readable name for the package. Note
              that it is not the name passed as an argument to pkg-config.

              This should be a brief description of the package

       URL:   An URL where people can get more information about and  download
              the package

              This   should  be  the  most-specific-possible  package  version

              This is a comma-separated list of packages that are required  by
              your package. Flags from dependent packages will be merged in to
              the flags reported for your package. Optionally, you can specify
              the  version  of the required package (using the operators =, <,
              >, >=, <=); specifying a version allows  pkg-config  to  perform
              extra  sanity  checks. You may only mention the same package one
              time on the Requires: line. If  the  version  of  a  package  is
              unspecified, any version will be used with no checking.

              A list of packages required by this package. The difference from
              Requires is that the packages listed under Requires.private  are
              not  taken into account when a flag list is computed for dynami-
              cally linked executable (i.e., when --static was not specified).
              In  the  situation where each .pc file corresponds to a library,
              Requires.private shall be used exclusively to specify the depen-
              dencies between the libraries.

              This  optional line allows pkg-config to perform additional san-
              ity checks, primarily to detect broken user installations.   The
              syntax  is  the  same  as Requires: except that you can list the
              same package more than once here, for example "foobar  =  1.2.3,
              foobar  = 1.2.5, foobar >= 1.3", if you have reason to do so. If
              a version isn't specified, then your package conflicts with  all
              versions  of the mentioned package.  If a user tries to use your
              package and a conflicting package at the same  time,  then  pkg-
              config will complain.

       Libs:  This  line  should give the link flags specific to your package.
              age.  Don't add any flags for required packages; pkg-config will
              add those automatically.

       pkg-config  was  written  by James Henstridge, rewritten by Martijn van
       Beers, and rewritten again by Havoc Pennington. Tim Janik, Owen Taylor,
       and  Raja  Harinath  submitted suggestions and some code.  gnome-config
       was written by Miguel de Icaza, Raja Harinath and  various  hackers  in
       the GNOME team.  It was inspired by Owen Taylor's gtk-config program.

       pkg-config  does  not  handle  mixing  of parameters with and without =
       well.  Stick with one.

       Bugs can be reported at under the pkg-con-
       fig component.

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