pkg-config file is broken when CMAKE_INSTALL_{DOC,INCLUDE,LIB}DIR is absolute

[alexshpilkin]

As per title: cmake/FindCTargets.cmake has

set(prefix ${CMAKE_INSTALL_PREFIX})
set(exec_prefix "\${prefix}")
# [snip]
set(includedir "\${prefix}/${CMAKE_INSTALL_INCLUDEDIR}")
set(libdir "\${exec_prefix}/${CMAKE_INSTALL_LIBDIR}")

and so can’t handle absolute paths in CMAKE_INSTALL_{INCLUDE,LIB}DIR. The handling of CMAKE_INSTALL_DOCDIR is more complex but similarly faulty. 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.