/usr/lib/x86_64-linux-gnu/pkgconfig/gdm-pam-extensions.pc is in libgdm-dev 3.28.3-0ubuntu18.04.4.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: GDM PAM Extensions
Description: Macros for custom protocols over PAM
Version: 3.28.3
Cflags: -I${includedir}/gdm
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