/usr/lib/x86_64-linux-gnu/pkgconfig/gdm.pc is in libgdm-dev 3.14.1-7.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: GDM Client Library
Description: Client Library for communicating with GDM daemon
Version: 3.14.1
Libs: -L${libdir} -lgdm
Cflags: -I${includedir}/gdm
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