--- /usr/portage/sys-cluster/mpich/mpich-3.0.4.ebuild	2013-07-09 17:37:55.000000000 -0500
+++ mpich-3.1_beta1.ebuild	2013-08-12 12:40:39.397048820 -0500
@@ -8,10 +8,10 @@
 
 inherit fortran-2
 
-MY_PV=${PV/_/}
+MY_PV=${PV/_beta/b}
 DESCRIPTION="A high performance and portable MPI implementation"
 HOMEPAGE="http://www.mpich.org/"
-SRC_URI="http://www.mpich.org/static/downloads/${PV}/${P}.tar.gz"
+SRC_URI="http://www.mpich.org/static/downloads/${MY_PV}/${PN}-${MY_PV}.tar.gz"
 
 SLOT="0"
 LICENSE="mpich"