When trying to call libpgplot.so.5 from the perl PGPLOT binidings there's an error: /usr/local/lib/libpgplot.so.5: Undefined symbol "_gfortran_concat_string" Perhaps the libraries need to be compiled with -lgfortran. If the compiler is indeed gfortran that is. Not sure how to do that though.
Closer analysis shows that this bug is caused by lang/p5ExtUtils-F77 having a hardcoded gfortran version: 4.8. Closing this one and opening a new on there.