Index: eclass/qt4-build.eclass
===================================================================
--- eclass.orig/qt4-build.eclass
+++ eclass/qt4-build.eclass
@@ -289,7 +289,7 @@ qt4-build_src_prepare() {
 	sed -i -e '/^QMAKE_\(LIB\|INC\)DIR\(_X11\|_OPENGL\|\)\t/s/=.*$/=/' \
 		mkspecs/$(qt_mkspecs_dir)/qmake.conf || die
 	# strip predefined CFLAGS from qmake ( bug #312689 )
-	sed -i '/^QMAKE_CFLAGS_\(RELEASE\|DEBUG\)/s:+=.*:+=:' mkspecs/common/g++.conf
+	sed -i '/^QMAKE_CFLAGS_RELEASE/s:+=.*:+=:' mkspecs/common/g++.conf
 
 	base_src_prepare
 }