--- qt4-build.eclass?revision=1.103	2011-12-12 14:55:36.097694963 +0400
+++ qt4-build.eclass	2011-12-12 14:52:03.000000000 +0400
@@ -18,7 +18,7 @@
 SRC_URI="http://get.qt.nokia.com/qt/source/${MY_P}.tar.gz"
 LICENSE="|| ( LGPL-2.1 GPL-3 )"
 
-IUSE="aqua debug pch"
+IUSE="aqua debug pch sse sse2 sse3 ssse3 sse4_1 sse4_2"
 
 [[ ${CATEGORY}/${PN} != x11-libs/qt-xmlpatterns ]] &&
 [[ ${CATEGORY}/${PN} != x11-themes/qgtkstyle ]] &&
@@ -367,6 +367,11 @@
 		myconf+=" $(pkg-config --cflags freetype2)"
 	fi
 
+	local flag
+	for flag in sse sse2 sse3 ssse3 sse4_1 sse4_2 ; do
+		use "${flag}" || myconf+=" -no-${flag/_/.}"
+	done
+
 	# Disable SSE4.x, since auto-detection is currently broken
 	# Upstream bug http://bugreports.qt.nokia.com/browse/QTBUG-13623
 	[[ ${PV} == "4.7.1" ]] && myconf+=" -no-sse4.1 -no-sse4.2"