/usr/lib/x86_64-linux-gnu/pkgconfig/gig.pc is in libgig-dev 4.1.0~repack-2.
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=${prefix}/include/libgig
Name: gig
Description: C++ library for accessing Gigasampler/GigaStudio, DLS, SoundFont and KORG sound files
Version: 4.1.0
Libs: -L${libdir} -lgig
Cflags: -I${includedir}
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