--- file_not_specified_in_diff	
+++ file_not_specified_in_diff	
@@ -16,1 +16,1 @@ 
-IUSE="doc fltk gif glut gsl hdf5 jpeg octave python qt4 wxwindows"
---
+IUSE="doc fltk gif glut gsl hdf5 jpeg octave openmp python qt4 wxwindows"
@@ -37,3 +37,14 @@ 
-	if ! version_is_at_least "4.3.0" "$(gcc-version)"; then
-		eerror "You need >=gcc-4.3.0 to compile this package"
-		die "Wrong gcc version"
---
+	if ( use openmp ) then
+	   if ( $(tc-getCC)$ == *gcc* ) then
+	      if ( $(gcc-major-version)$(gcc-minor-version) -lt 43 ) then
+		  eerror "You are using gcc and OpenMP is only available with gcc >= 4.2 "
+		  eerror "mathgl requires at least gcc >= 4.3"
+		  eerror "If you want to use gcc you also need to enable the openmp useflag for gcc"
+		  die "wrong compiler version"
+	      elif ( ! built_with_use sys-devel/gcc openmp ) then
+		  eerror "You are using gcc, gcc needs to be build with the openmp useflag"
+		  die "Wrong configuration for gcc"
+	      fi
+	    fi
+	    einfo "You are not using gcc"
+	    einfo "You should ensure that your compiler is providing support for openmp"
@@ -54,0 +65,2 @@ 
+	epatch "${FILESDIR}"/${P}-openmp.patch
+	cp "${FILESDIR}/ax_openmp.m4" "${S}/config/"
@@ -79,0 +92,1 @@ 
+		$(use_enable openmp) \