/usr/lib/pkgconfig/sigc++-1.2.pc is in libsigc++-1.2-dev 1.2.7-2.
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
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
Name: SigC++
Description: Type-safe signal and callback system for C++
Version: 1.2.7
Libs: -L${libdir} -lsigc-1.2
Cflags: -I${libdir}/sigc++-1.2/include -I${includedir}/sigc++-1.2
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