/usr/lib/x86_64-linux-gnu/pkgconfig/sigx-2.0.pc is in libsigx-2.0-dev 2.0.2-5ubuntu1.
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=${prefix}
libdir=/usr/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: sigx++
Description: An interthread communication library for c++ on top of libsigc++ and glibmm
Version: 2.0.1
URL: http://www.assembla.com/spaces/sigx
Requires: glibmm-2.4 gthread-2.0
Libs: -L${libdir} -lsigx-2.0
Cflags: -I${libdir}/sigx-2.0 -I${includedir}/sigx-2.0
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