sysroot/usr/lib32/pkgconfig/gl.pc

prefix=/usr
exec_prefix=${prefix}
libdir=/usr/lib
includedir=/usr/include

Name: gl
Description: Mesa OpenGL library
Requires.private: x11 xext
Version: 7.7.1
Libs: -L${libdir} -lGL
Libs.private: -lm -lpthread
Cflags: -I${includedir}