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+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. It's more useful to the compilation process than to
+the end-user.
+
+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 for these files in the following directories:
+${PREFIX}/libdata/pkgconfig, ${PREFIX}/lib/pkgconfig,
+${LOCALBASE}/libdata/pkgconfig, ${LOCALBASE}/lib/pkgconfig,
+${X11BASE}/libdata/pkgconfig, and ${X11BASE}/lib/pkgconfig; it will also look
+in the list of directories specified by the PKG_CONFIG_PATH environment
+variable.
+
+WWW: http://pkgconfig.freedesktop.org/wiki/