See blocked bug for details. Note that sci-libs/matio-1.5.0 removes fortran support.
+ 22 Sep 2012; Kacper Kowalik <xarthisius@gentoo.org> + -files/matio-1.3.4-autotools.patch, -matio-1.3.4.ebuild: + Drop old, fixes bug #435928 by Ben Longbons <b.r.longbons@gmail.com>