--- a/components/apr/Makefile	Fri May 01 10:10:21 2015 -0700
+++ b/components/apr/Makefile	Fri Apr 17 01:53:46 2015 -0700
@@ -84,6 +84,7 @@
 test: $(TEST_32_and_64)
 
 
+REQUIRED_PACKAGES += developer/documentation-tool/doxygen
 REQUIRED_PACKAGES += shell/bash
 REQUIRED_PACKAGES += shell/ksh93
 REQUIRED_PACKAGES += system/library