/usr/lib/x86_64-linux-gnu/pkgconfig/ignition-math2.pc is in libignition-math2-dev 2.9.0+dfsg1-1.
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 | prefix=/usr
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include/ignition/math2
Name: Ignition Math
Description: A set of math classes for robot applications
Version: 2.9.0
Requires:
Libs: "-L${libdir}" -lignition-math2
CFlags: "-I${includedir}" -std=c++11
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