--- mathgl-1.8.1.ebuild.orig	2009-08-13 00:08:24.000000000 +1200
+++ mathgl-1.8.1.ebuild	2009-08-13 00:14:32.000000000 +1200
@@ -13,7 +13,7 @@
 LICENSE="GPL-2"
 SLOT="0"
 KEYWORDS="~amd64 ~x86"
-IUSE="doc fltk gif glut gsl hdf5 jpeg octave python qt4 wxwindows"
+IUSE="doc fltk gif glut gsl hdf5 jpeg octave python qt4 wxwindows openmp"
 
 RDEPEND="media-libs/libpng
 	virtual/glu
@@ -26,7 +26,8 @@
 	gsl? ( sci-libs/gsl )
 	octave? ( sci-mathematics/octave )
 	qt4? ( x11-libs/qt-gui:4 )
-	wxwindows? ( x11-libs/wxGTK:2.8 )"
+	wxwindows? ( x11-libs/wxGTK:2.8 )
+	openmp? ( sys-devel/gcc[openmp] )"
 DEPEND="${RDEPEND}
 	doc? ( app-text/texi2html virtual/texi2dvi )
 	python? ( dev-lang/swig )
@@ -44,6 +45,8 @@
 	epatch "${FILESDIR}"/${P}-gcc43.patch
 	# bug 274282
 	epatch "${FILESDIR}"/${P}-gcc44.patch
+	# bug 280642
+	epatch "${FILESDIR}/${P}-openmp.patch"
 
 	# correct location of numpy/arrayobject.h
 	if use python; then
@@ -70,7 +73,8 @@
 		$(use_enable python) \
 		$(use_enable octave) \
 		$(use_enable gsl) \
-		$(use_enable doc docs)
+		$(use_enable doc docs) \
+		$(use_enable openmp)
 }
 
 src_compile() {