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--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -16,7 +16,7 @@
 	${MAKE} -C lib
 	${MAKE} -C index recollindex
 	@NOQTMAKE@(cd $(QTGUI); ${QMAKE} recoll.pro)
-	@NOQTMAKE@${MAKE} -C $(QTGUI) depth=..
+	@NOQTMAKE@${MAKE} -C $(QTGUI) depth=.. prefix=$(prefix) exec_prefix=$(exec_prefix) libdir=$(libdir)
 	@NOPYTHON@${MAKE} -C python/recoll libdir=$(libdir)
 	${MAKE} -C query recollq xadump