/usr/lib/pkgconfig/ginac.pc is in libginac-dev 1.6.2-1.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
Name: GiNaC
Description: C++ library for symbolic calculations
Version: 1.6.2
Requires: cln >= 1.1.6
Libs: -L${libdir} -lginac
Cflags: -I${includedir}
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