Log Message:
If math/gsl is already installed, packaging becomes different. So add as
prerequisite (buildlink3). Thanks Dave Tyson for the report at pkgsrc-users@.
PKGREVISION++. Those two depends on gnuradio-fec, so the same situation as it.
(PLIST of these two are NOT affected, but actuall installation PLIST will
be different because of gnuradio-fec is also installed with those).