/usr/lib/x86_64-linux-gnu/pkgconfig/libva-glx.pc is in libva-dev 1.0.15-4.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
display=glx
Name: libva-${display}
Description: Userspace Video Acceleration (VA) ${display} interface
Requires: libva
Version: 0.32.0
Libs: -L${libdir} -lva-${display}
Cflags: -I${includedir}
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