diff --git a/Makefile b/Makefile
index 85aa6d7eec7..7146bfbef52 100644
--- a/Makefile
+++ b/Makefile
@@ -34,6 +34,9 @@ tools-only: all
 install-includes:
 	$(MKDIR) $(DESTDIR)$(includedir)/llvm
 	cd include && find * '!' '(' -name '*~' -o -name .cvsignore ')' -print | grep -v CVS | pax -rwdvpe $(DESTDIR)$(includedir)/llvm
+ifneq ($(BUILD_SRC_ROOT),$(BUILD_OBJ_ROOT))
+	cd $(BUILD_SRC_ROOT)/include && find * '!' '(' -name '*~' -o -name .cvsignore ')' -print | grep -v CVS | pax -rwdvpe $(DESTDIR)$(includedir)/llvm
+endif
 
 install:: install-includes