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. pkg-config retrieves information about packages from special metadata files. These files are named after the package, with the extension .pc. By default, pkg-config looks in the following directories: ${PREFIX}/libdata/pkgconfig, ${LOCALBASE}/libdata/pkgconfig and ${X11BASE}/libdata/pkgconfig for these files; it will also look in the list of directories 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"). WWW: http://www.freedesktop.org/software/pkgconfig/ http://pkgconfig.sourceforge.net