PKGCONF(1)

; SPDX-FileCopyrightText: 2022 pkgconf authors
; SPDX-License-Identifier: ISC

# NAME

pkgconf — a system for configuring build dependency information

# SYNOPSIS

*pkgconf* [_options_] [_list of modules_]

# DESCRIPTION

*pkgconf* 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.

# GENERAL OPTIONS

*--atleast-pkgconfig-version*=_VERSION_
	Exit with error if we do not support the requested pkg-config version.

*--define-prefix*
	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.

*--dont-define-prefix*
	Disables the ‘define-prefix’ feature.

*--dont-relocate-paths*
	Disables the path relocation feature.

*--env-only*
	Learn about pkgconf's configuration strictly from environmental variables.

*--errors-to-stdout*
	Print all errors on the main output stream instead of the error output
	stream.

*--ignore-conflicts*
	Ignore ‘Conflicts’ rules in modules.

*--list-all*
	Walk all directories listed in the _PKG_CONFIG_PATH_ environmental variable
	and display information on packages which have registered information there.

*--maximum-traverse-depth*=_DEPTH_
	Impose a limit on the allowed depth in the dependency graph. For example,
	a depth of 2 will restrict the resolver from acting on child dependencies
	of modules added to the resolver's solution.

*--no-cache*
	Skip caching packages when they are loaded into the internal resolver.
	This may result in an alternate dependency graph being computed.

*--no-provides*
	Ignore ‘Provides’ rules in modules when resolving dependencies.

*--prefix-variable*=_VARIABLE_
	Sets the ‘prefix’ variable used by the ‘define-prefix’ feature.

*--pure*
	Treats the computed dependency graph as if it were pure. This is mainly
	intended for use with the *--static* flag.

*--relocate*=_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.

*--shared*
	Compute a simple dependency graph that is only suitable for shared linking.

*--silence-errors*
	Do not display any errors at all.

*--simulate*
	Simulates resolving a dependency graph based on the requested modules on
	the command line. Dumps a series of trees denoting pkgconf's resolver state.

*--static*
	Compute a deeper dependency graph and use compiler/linker flags intended
	for static linking.

*--with-path*=_PATH_
	Adds a new module search path to pkgconf's dependency resolver. Paths added
	in this way are given preference before other paths.

*--validate* _package ..._
	Validate specific ‘.pc’ files for correctness.

*--version*
	Display the supported pkg-config version and exit.

# MODULE-SPECIFIC OPTIONS

*--atleast-version*=_VERSION_
	Exit with error if a module's version is less than the specified version.

*--exact-version*=_VERSION_
	Exit with error if a module's version is not exactly the specified version.

*--exists*
	Exit with a non-zero result if the dependency resolver was unable to find
	all of the requested modules.

*--max-version*=_VERSION_
	Exit with error if a module's version is greater than the specified
	version.

*--no-uninstalled*
	Forbids the dependency resolver from considering 'uninstalled' modules as
	part of a solution.

*--uninstalled*
	Exit with a non-zero result if the dependency resolver uses an
	‘uninstalled’ module as part of its solution.

# QUERY-SPECIFIC OPTIONS

*--cflags*, *--cflags-only-I*, *--cflags-only-other*
	Display either all CFLAGS, only *-I* CFLAGS or only CFLAGS that are not
	*-I*.

*--define-variable*=_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.

*--digraph*
	Dump the dependency resolver's solution as a graphviz ‘dot’ file. This can
	be used with graphviz to visualize module interdependencies.

*--env*=_VARNAME_
	Print the requested values as variable declarations in a similar format as
	the *env*(1) command.

*--fragment-filter*=_TYPES_
	Filter the fragment lists for the specified types.

*--libs*, *--libs-only-L*, *--libs-only-l*, *--libs-only-other*
	Display either all linker flags, only *-L* linker flags, only *-l* linker
	flags or only linker flags that are not *-L* or *-l*.

*--modversion*
	Print the version of the queried module.

*--keep-system-cflags*, *--keep-system-libs*
	Keep CFLAGS or linker flag fragments that would be filtered due to being
	included by default in the compiler.

*--path*
	Display the filenames of the ‘.pc’ files used by the dependency resolver for
	a given dependency set.

*--print-provides*
	Print all relevant ‘Provides’ entries for a module to the output channel.

*--print-requires*, *--print-requires-private*
	Print the modules included in either the Requires field or the
	Requires.private field.

*--print-variables*
	Print all seen variables for a module to the output channel.

*--variable*=_VARNAME_
	Print the value of _VARNAME_.

# ENVIRONMENT

_DESTDIR_
	If set to _PKG_CONFIG_SYSROOT_DIR_, assume that
	_PKG_CONFIG_FDO_SYSROOT_RULES_ is set.

_PKG_CONFIG_DEBUG_SPEW_
	If set, enables additional debug logging.  The format of the debug log
	messages is implementation-specific.

_PKG_CONFIG_DISABLE_UNINSTALLED_
	If set, enables the same behaviour as the *--no-uninstalled* flag.

_PKG_CONFIG_DONT_RELOCATE_PATHS_
	If set, disables the path relocation feature.

_PKG_CONFIG_FDO_SYSROOT_RULES_
	If set, follow the sysroot prefixing rules that freedesktop.org pkg-config
	uses.

_PKG_CONFIG_LIBDIR_
	List of primary directories where ‘.pc’ files are looked up.

_PKG_CONFIG_LOG_
	‘logfile’ which is used for dumping audit information concerning installed
	module versions.

_PKG_CONFIG_MSVC_SYNTAX_
	If set, uses MSVC syntax for fragments.

_PKG_CONFIG_PATH_
	List of secondary directories where ‘.pc’ files are looked up.

_PKG_CONFIG_PURE_DEPGRAPH_
	If set, enables the same behaviour as the *--pure* flag.

_PKG_CONFIG_SYSROOT_DIR_
	‘sysroot’ directory, will be prepended to every path defined in
	PKG_CONFIG_PATH.  Useful for cross compilation.

_PKG_CONFIG_SYSTEM_INCLUDE_PATH_
	List of paths that are considered system include paths by the toolchain.
	This is a pkgconf-specific extension.

_PKG_CONFIG_SYSTEM_LIBRARY_PATH_
	List of paths that are considered system library paths by the toolchain.
	This is a pkgconf-specific extension.

_PKG_CONFIG_TOP_BUILD_DIR_
	Provides an alternative setting for the ‘pc_top_builddir’ global variable.

# EXAMPLES

Displaying the CFLAGS of a package:

```
$ pkgconf --cflags foo
-fPIC -I/usr/include/foo
```

# SEE ALSO

*pc*(5), *pkg.m4*(7)