--- a/components/apr-util-1_5/Makefile	Fri May 01 10:10:21 2015 -0700
+++ b/components/apr-util-1_5/Makefile	Fri Apr 17 01:53:46 2015 -0700
@@ -87,6 +87,7 @@
 test: $(TEST_32_and_64)
 
 
+REQUIRED_PACKAGES += developer/documentation-tool/doxygen
 REQUIRED_PACKAGES += database/mysql-55/library
 REQUIRED_PACKAGES += database/sqlite-3
 REQUIRED_PACKAGES += library/apr-15