/usr/lib/x86_64-linux-gnu/pkgconfig/gdkglextmm-x11-1.2.pc is in libgtkglextmm-x11-1.2-dev 1.2.0-8.
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=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
target=x11
api_version=1.2
multihead=yes
Name: gdkglextmm
Description: C++ Wrapper for GdkGLExt (${target} target)
Version: 1.2.0
Requires: gdkglext-1.0 gdkmm-2.4 pangomm-1.4
Libs: -L${libdir} -lgdkglextmm-${target}-1.2
Cflags: -I${includedir}/gtkglextmm-${api_version} -I${libdir}/gtkglextmm-${api_version}/include
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