FindPkgConfig: <prefix>_LINK_LIBRARIES is not cached
<prefix>_LINK_LIBRARIES seems to be a normal variable and is unavailable outside the scope where e.g. pkg_check_modules() was called, unlike all the other result variables, which are cached.
Also, the FindPkgConfig module documentation is somewhat misleading in the sense that it hints a <prefix>_STATIC_LINK_LIBRARIES will also be produced, which is not the case. I realize it was removed for the time being, just saying the docs don't currently match.
Edited by Miloš Komarčević