/usr/lib/x86_64-linux-gnu/pkgconfig/gaiagraphics.pc is in libgaiagraphics-dev 0.5-1.
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 | # Package Information for pkg-config
prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: gaiagraphics
Description: Gaia Common Graphics Support
Version: 1.0
Libs: -L${libdir} -lgaiagraphics
Cflags: -I${includedir}
|