/usr/lib/x86_64-linux-gnu/pkgconfig/gerris3D.pc is in libgfs-mpi-dev 20131206+dfsg-7.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: Gerris3D
Description: Gerris Flow Solver Library (3D)
Version: 1.3.2
Requires: gts >= 0.7.3
Libs: -L${libdir} -lgfs3D -lgts -lm
Cflags: -I${includedir}
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