Index: hwoarang/development/gentoo-x86/eclass/qt4-build.eclass
===================================================================
--- hwoarang.orig/development/gentoo-x86/eclass/qt4-build.eclass
+++ hwoarang/development/gentoo-x86/eclass/qt4-build.eclass
@@ -14,6 +14,12 @@
 inherit base eutils multilib toolchain-funcs flag-o-matic versionator
 
 IUSE="${IUSE} debug pch"
+
+# add 'exceptions' use flag, wrt bug 240185. This change must not
+# affect 4.4.2 and 4.5.1 stable packages
+[[ ${CATEGORY}/${PN} != x11-libs/qt-xmlpatterns ]] && [[ ${PV} !=  "4.4.2" ]] && \
+[[ ${PV} != "4.5.1" ]] && IUSE="${IUSE} exceptions"
+
 RDEPEND="
 	!<x11-libs/qt-assistant-${PV}
 	!>x11-libs/qt-assistant-${PV}-r9999
@@ -292,7 +298,7 @@ standard_configure_options() {
 		-plugindir ${QTPLUGINDIR} -sysconfdir ${QTSYSCONFDIR}
 		-translationdir ${QTTRANSDIR} -examplesdir ${QTEXAMPLESDIR}
 		-demosdir ${QTDEMOSDIR} -silent -fast
-		$([[ ${PN} == qt-xmlpatterns ]] || echo -no-exceptions)
+		$(has exceptions ${IUSE} && ! use exceptions && echo -no-exceptions)
 		-reduce-relocations -nomake examples -nomake demos"
 
 	# Make eclass 4.5.{1,2} ready