pkg-config file is broken when CMAKE_INSTALL_LIBDIR is absolute

[alexshpilkin]

As per title: libdnf/libdnf.pc.in has

prefix=@CMAKE_INSTALL_PREFIX@
libdir=${prefix}/@CMAKE_INSTALL_LIBDIR@

and so can’t handle absolute paths in CMAKE_INSTALL_LIBDIR. This leads to broken .pc files on NixOS in particular.

See “Concatenating paths when building pkg-config files” for a thorough discussion of the problem and a suggested fix, or KDE’s extra-cmake-modules for a simpler approach.

[j-mracek]

Thank you very much for the report. Unfortunately we do not have an experience with NixOS therefore it is quite difficult to fix the issue for us. We will support the community contribution to resolve the issue by PR review and patch testing but it all what we can offer.