/usr/lib/pkgconfig/gtkglext-x11-1.0.pc is in libgtkglext1-dev 1.2.0-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
target=x11
api_version=1.0
multihead=yes
Name: GtkGLExt
Description: OpenGL Extension to GTK+ (${target} target)
Version: 1.2.0
Requires: gdkglext-${target}-${api_version} gtk+-2.0
Libs: -L${libdir} -lgtkglext-${target}-${api_version}
Cflags: -I${includedir}/gtkglext-${api_version}
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