Although $alien->libs() now includes the proper library path, i.e. "-L/home/visitors/dcmertens/perl5/lib/perl5/auto/share/dist/Alien-FFCall/lib", it does not include the corresponding library link command, i.e. "-lffcall". It should be a simple enough fix, though it raises the question: should this be offered through a function for the consumer (i.e. a new method $alien->libs_with_l()) or should it be a configuration option for the Alien author, (i.e. alien_include_l => 1)?
On second thought, this may be a feature, not a bug.
This is configurable from the Alien author's end with alien_provides_libs. That makes this ticket incorrect, and thus closed.
Actually there were bugs, even though it was configurable, so this was a good bug. I have now fixed it though. @30b4a39