--- /usr/portage/sci-chemistry/vmd/vmd-1.8.7.ebuild	2009-09-18 16:36:34.000000000 +0200
+++ vmd-1.8.7.ebuild	2009-11-17 16:40:49.000000000 +0100
@@ -13,7 +13,7 @@ SRC_URI="${P}.src.tar.gz"
 
 SLOT="0"
 KEYWORDS="~amd64 ~ppc ~x86"
-IUSE=""
+IUSE="msms"
 
 RESTRICT="fetch"
 
@@ -34,7 +34,8 @@ DEPEND="x11-libs/libXft
 	sci-libs/netcdf"
 
 RDEPEND="${DEPEND}
-	x11-terms/xterm"
+	x11-terms/xterm
+	msms? ( sci-chemistry/msms-bin )"
 
 VMD_DOWNLOAD="http://www.ks.uiuc.edu/Development/Download/download.cgi?PackageName=VMD"