pkg-config(1)
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 frameworks. This allows build systems to detect other
dependencies and use them with the system toolchain.
GENERAL OPTIONS
--version
Display the supported pkg-config version and exit.
--atleast-pkgconfig-version=VERSION
Exit with error if we do not support the requested pkg-config
version.
--errors-to-stdout
Print all errors on the main output stream instead of the error
output stream.
--silence-errors
Do not display any errors at all.
--list-all
Walk all directories listed in the PKG_CONFIG_PATH environmental
variable and display information on packages which have
registered information there.
--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.
--no-cache
Skip caching packages when they are loaded into the internal
resolver. This may result in an alternate dependency graph being
computed.
--ignore-conflicts
Ignore ‘Conflicts’ rules in modules.
--env-only
Learn about pkgconf's configuration strictly from environmental
variables.
--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.
--static
Compute a deeper dependency graph and use compiler/linker flags
intended for static linking.
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.
--max-version=VERSION
Exit with error if a module's version is greater than the
specified version.
--exists
Exit with a non-zero result if the dependency resolver was able
to find all of the requested modules.
--uninstalled
Exit with a non-zero result if the dependency resolver uses an
‘uninstalled’ module as part of it's solution.
--no-uninstalled
Forbids the dependency resolver from considering 'uninstalled'
modules as part of a 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.
--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.
--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.
--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.
--print-variables
Print all seen variables for a module to the output channel.
--variable=VARNAME
Print the value of VARNAME.
--print-requires, --print-requires-private
Print the modules included in either the Requires field or the
Requires.private field.
--digraph
Dump the dependency resolver's solution as a graphviz ‘dot’ file.
This can be used with graphviz to visualize module
interdependencies.
ENVIRONMENT
PKG_CONFIG_PATH
List of directories where ‘.pc’ files are looked up.
PKG_CONFIG_SYSROOT_DIR
‘sysroot’ directory, will be prepended to every path defined in
PKG_CONFIG_PATH. Useful for cross compilation.
EXAMPLES
Displaying the CFLAGS of a package:
$ pkgconf --cflags foo
-fPIC -I/usr/include/foo
Opportunity
Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.
Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.
Free Software
Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.
Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.
Free Books
The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.
Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.
Education
Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.
Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.
