The following options are supported:
--version
Displays the version of pkg-config and terminates.
--help Displays a help message and terminates.
--cflags
This prints pre-processor and compile flags required to compile the packages on the command line,
including flags for all their dependencies. gadap-config exits with a nonzero code if it can't
find metadata for one or more of the packages on the command line.
--libs This option is identical to "--cflags", only it prints the link flags.
--cc This option lists the C compiler that should be used for compatability.
-cxx This option lists the C++ compiler that should be used for compatability.
--prefix
This option prints the value of the prefix variable, giving the location at which the library was
installed.