/usr/lib/x86_64-linux-gnu/pkgconfig/libg3d.pc is in libg3d-dev 0.0.8-22.
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=${prefix}/include
Name: libg3d
Version: 0.0.8
Description: 3D object loading library
Requires.private: glib-2.0
Libs: -L${libdir} -lg3d
Libs.private: -lm -lgsf-1 -lgobject-2.0 -lglib-2.0 -lxml2
Cflags: -I${includedir}
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