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The pkgconfig package contains tools for passing the include path
and/or library paths to build tools during the make file execution.
pkg-config is a function that returns meta information for the specified library.
The default setting for PKG_CONFIG_PATH is /usr/lib/pkgconfig
because of the prefix we use to install pkgconfig. You may add to
PKG_CONFIG_PATH by exporting additional paths on your system where
pkgconfig files are installed. Note that PKG_CONFIG_PATH is only needed
when compiling packages, not during run-time.
        ÔÚĬÈÏÇé¿öÏ£¬Ã¿¸öÖ§³Ö pkg-config µÄ¿â¶ÔÓ¦µÄ .pc ÎļþÔÚ°²×°ºó¶¼Î»ÓÚ°²×°Ä¿Â¼ÖÐµÄ lib/pkgconfig
Ŀ¼Ï¡£ÀýÈ磬ÎÒÃÇÔÚÉÏÃæÒѾ­½« Glib °²×°ÔÚ /opt/gtk Ŀ¼ÏÂÁË£¬ÄÇôÕâ¸ö Glib ¿â¶ÔÓ¦µÄ .pc ÎļþÊÇ
/opt/gtk/lib/pkgconfig Ŀ¼ÏÂÒ»¸ö½Ð glib-2.0.pc µÄÎļþ£º
prefix=/opt/gtk/
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
glib_genmarshal=glib-genmarshal
gobject_query=gobject-query
glib_mkenums=glib-mkenums
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