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PKG-CONFIG(1) General Commands Manual PKG-CONFIG(1)

pkg-config — a system for configuring build dependency information

pkg-config [options] module ...

pkg-config is a program which helps to configure compiler and linker flags for development libraries. This allows build systems to detect other dependencies and use them with the system toolchain.

The options are as follows:

Print the version number, the Copyright notice, and the license of the pkg-config program to standard output and exit. Most other options and all command line arguments are ignored.
=version
Exit with error if the requested version number is greater than the version number of the pkg-config program.
=version
Exit with error if the version number of each module is less than the specified version number.
, --cflags-only-I, --cflags-only-other
Print all compiler flags required to compile against the module, or only the include path (-I) flags, or only the compiler flags that are not include path flags, respectively.
Print some non-fatal warning messages to standard error output that would otherwise silently be ignored. If pkg-config was compiled without defining the preprocessor macro PKGCONF_LITE, this option also prints many debugging messages to standard error output.
Attempts to determine the prefix variable to use for CFLAGS and LIBS entry relocations. This is mainly useful for platforms where framework SDKs are relocatable, such as Windows.
=varname=value
Define varname as value. Variables are used in query output, and some modules' results may change based on the presence of a variable definition.
Dump the dependency resolver's solution as a graphviz ‘dot’ file. This can be used with graphviz to visualize module interdependencies. This option is only available if the preprocessor macro PKGCONF_LITE was not defined during compilation.
Disables the ‘define-prefix’ feature.
Disables the path relocation feature.
=varname
Print the requested values as variable declarations in a similar format as the env(1) command.
Initialize the module search path from --with-path and PKG_CONFIG_PATH only, ignoring PKG_CONFIG_LIBDIR and the compiled-in default directories.
Print all error, warning, and debugging messages to standard output instead of to standard error output.
=version
Exit with error if no module has exactly the specified version number.
Exit with a non-zero exit status if the dependency resolver is unable to find all of the requested modules. This option is active by default and cannot be disabled. However, various other options cause pkg-config to exit and report success or failure before all arguments have been inspected.
=types
Filter the fragment lists for the specified types.
Ignore ‘Conflicts’ rules in modules.
, --keep-system-libs
Keep CFLAGS or linker flag fragments that would be filtered due to being included by default in the compiler.
, --libs-only-L, --libs-only-l, --libs-only-other
Print all linker flags required to link against the module, or only the library path (-L) flags, or only the library (-l) flags, or only the linker flags that are neither library path nor library flags, respectively.
Walk the module search path in the order of descending priority. For each pc(5) file found, print one line to standard output, containing the basename of the file without the extension, the Name property, a dash (‘-’), and the Description property.
Perform the same search as --list-all, but only print the basename of each pc(5) file without the extension, not the module name and the description.
=file
Set the name of the output file where information about selected modules is logged, both about those selected by arguments and as dependencies. For each selected module, one line is printed to standard output, containing the basename of the pc(5) file without the extension, optionally an operator and version number describing the desired range of versions, and either the actual version number in square brackets or the string "NOT-FOUND". If this option is not provided, the name of the output file is instead taken from the PKG_CONFIG_LOG environment variable, and if that is not provided either, this kind of logging is disabled.
=version
Exit with error if the version number of each module is greater than the specified version number.
=depth
Impose a limit on the allowed depth in the dependency graph. For example, a depth of 2 restricts the resolver from acting on child dependencies of modules added to the resolver's solution.
For each specified module, print the version number to standard output. If the --verbose option is also specified, the name of the respective module and a colon is printed before each version number. This option implies --maximum-traverse-depth=1 and overrides and disables all --cflags and --libs flags.
Skip caching packages when they are loaded into the internal resolver. This may result in an alternate dependency graph being computed.
Ignore ‘Provides’ rules in modules when resolving dependencies.
Forbids the dependency resolver from considering 'uninstalled' modules as part of a solution.
For the first module given on the command line, let the dependency resolver find the pc(5) file describing that module, print the absolute pathname of that file to standard output, and exit immediately, ignoring most other options and all other arguments.
=variable
Sets the ‘prefix’ variable used by the ‘define-prefix’ feature.
Print some messages about fatal errors to standard error output that would otherwise be omitted. This option is implied by many other options, but not by all. It can be overridden with --silence-errors.
For each specified module, print one line to standard output containing the Name property, an equal sign (‘=’), and the Version property. If the module contains one or more Provides properties, print additional lines in dependency list format, one name per line, each name optionally followed by an operator and a version. This option implies --maximum-traverse-depth=1 and overrides and disables all --cflags and --libs flags.
For each specified module, print the Requires or Requires.private properties, respectively, in dependency list format to standard output. Both of these options imply --maximum-traverse-depth=1 and override and disable all --cflags and --libs flags.
Print all seen variables for a module to the output channel.
Treats the computed dependency graph as if it were pure. This is mainly intended for use with the --static flag.
=path
Relocates a path using the pkgconf_path_relocate API. This is mainly used by the testsuite to provide a guaranteed interface to the system's path relocation backend.
Compute a simple dependency graph that is only suitable for shared linking.
When printing error messages about modules that are not found or conflict with each other, avoid printing additional, verbose instructions explaining potential methods for solving the problem.
Do not print any error, warning, or debugging messages at all. Overrides all of --debug, --errors-to-stdout, and --print-errors.
Simulates resolving a dependency graph based on the requested modules on the command line. Dumps a series of trees denoting pkgconf's resolver state. This option is only available if the preprocessor macro PKGCONF_LITE was not defined during compilation.
Compute a deeper dependency graph and use compiler/linker flags intended for static linking.
Exit with a non-zero result if the dependency resolver uses an ‘uninstalled’ module as part of its solution.
package ...
Validate specific ‘.pc’ files for correctness.
=varname
Print the value of varname.
This option only has an effect if --modversion is also specified. It prints the name of the respective module and a colon before each version number.
Print the version number of the pkg-config program to standard output and exit. Most other options and all command line arguments are ignored.
=path
Prepend the directory path to the module search path, giving it priority over all other directories including those from PKG_CONFIG_PATH and PKG_CONFIG_LIBDIR.

If set to PKG_CONFIG_SYSROOT_DIR, assume that PKG_CONFIG_FDO_SYSROOT_RULES is set.
If set, enables additional debug logging. The format of the debug log messages is implementation-specific.
If set, enables the same behaviour as the --no-uninstalled flag.
If set, disables the path relocation feature.
If set, follow the sysroot prefixing rules that freedesktop.org pkg-config uses.
A colon-separated list of low-priority directories where pc(5) files are looked up. The module search path is constructed by appending this list to PKG_CONFIG_PATH, which enjoys higher priority. If PKG_CONFIG_LIBDIR is not defined, the default list compiled into the pkg-config program from the PKG_DEFAULT_PATH preprocessor macro is appended instead. If PKG_CONFIG_LIBDIR is defined but empty, nothing is appended.
If set, log information about selected modules to the file with the name stored in this variable. For more details, see the --log-file command line option, which overrides this variable.
If set, uses MSVC syntax for fragments.
A colon-separated list of high-priority directories where pc(5) files are looked up. The module search path is constructed by prepending the directory specified with --with-path, if any, and unless --env-only is specified, by appending either PKG_CONFIG_LIBDIR or the compiled-in default directories with lower priority.
If set, enables the same behaviour as the --pure flag.
‘sysroot’ directory, will be prepended to every path defined in PKG_CONFIG_PATH. Useful for cross compilation.
List of paths that are considered system include paths by the toolchain. This is a pkgconf-specific extension.
List of paths that are considered system library paths by the toolchain. This is a pkgconf-specific extension.
Provides an alternative setting for the ‘pc_top_builddir’ global variable.

The pkg-config utility exits 0 on success, and >0 if an error occurs.

Displaying the CFLAGS of a package:

$ pkg-config --cflags foo
-fPIC -I/usr/include/foo

pc(5), pkg.m4(7)

May 11, 2025 OpenBSD-current