/usr/lib/x86_64-linux-gnu/pkgconfig/libs3d.pc is in libs3d-dev 0.2.2-7build1.
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=/usr/bin
libdir=/usr/lib/x86_64-linux-gnu
includedir=/usr/include
Name: libs3d
Version: 0.2.2
Description: Client library for the s3d server
Requires.private: libg3d freetype2 fontconfig
Libs.private: -lm
Libs: -L${libdir} -ls3d
Cflags: -I${includedir}
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