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/usr/lib/pkgconfig/gtkgl-2.0.pc is in libgtkgl2.0-dev 2.0.1-2.2.

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

Name: GtkGLArea
Description: an OpenGL widget for GTK+
Version: 2.0.1
Requires: gtk+-2.0
Libs: -L${libdir} -lgtkgl-2.0  -lGLU -lGL
Cflags: -I${includedir}/gtkgl-2.0