diff -u -r ../apt-1.2.12/doc/makefile ./doc/makefile
--- ../apt-1.2.12/doc/makefile  2016-05-11 08:57:51.000000000 +0000
+++ ./doc/makefile      2016-05-24 20:14:30.535233236 +0000
@@ -10,7 +10,7 @@
 LC = en
 include $(DOCBOOK_H)
 
-doc: manpages docbook
+doc: manpages
 
 examples/sources.list: ../vendor/current/sources.list
        ln -sf '$(abspath $^)' $@