diff -urN apt-0.7.20.2.orig/doc/makefile apt-0.7.20.2/doc/makefile
--- apt-0.7.20.2.orig/doc/makefile	2009-02-07 16:09:35.000000000 +0100
+++ apt-0.7.20.2/doc/makefile	2009-09-30 09:25:59.000000000 +0200
@@ -43,7 +43,7 @@
 doc.pl: %.pl:
 	$(MAKE) -C pl $*
 
-ifdef DOXYGEN
+ifdef DOXYGEN_IS_DISABLED
 DOXYGEN_SOURCES = $(shell find $(BASE)/apt-pkg -not -name .\\\#* -and \( -name \*.cc -or -name \*.h \) )
 
 clean: doxygen-clean