--- /usr/portage/media-libs/opencv/opencv-2.4.6.1.ebuild	2013-09-05 02:43:16.000000000 +0800
+++ /usr/portage/media-libs/opencv/opencv-2.4.6.1.ebuild	2013-09-27 11:27:33.340026271 +0800
@@ -113,7 +113,6 @@ 
 		-DWITH_OPENNI=OFF					# not packaged
 		$(cmake-utils_use_with png)
 		-DWITH_PVAPI=OFF					# not packaged
-		$(cmake-utils_use_with qt4 QT)
 		-DWITH_QUICKTIME=OFF
 		$(cmake-utils_use_with threads TBB)
 		$(cmake-utils_use_with tiff)
@@ -143,6 +142,11 @@ 
 		-DENABLE_SSE42=OFF
 		-DOPENCV_EXTRA_FLAGS_RELEASE=""				# black magic
 	)
+	if use qt4; then
+		mycmakeargs+=( -DWITH_QT=4 )
+	else
+		mycmakeargs+=( -DWITH_QT=OFF )
+	fi
 
 	if use cuda; then
 		if [[ "$(gcc-version)" > "4.6" ]]; then