simplistic perl interface to pkg-config

 The pkg-config program retrieves information about installed libraries,
 usually for the purposes of compiling against and linking to them.
 .
 ExtUtils::PkgConfig is a very simplistic interface to this utility, intended
 for use in the Makefile.PL of perl extensions which bind libraries that
 pkg-config knows. It is really just boilerplate code that you would've
 written yourself.