diff --git a/docs/Makefile.am b/docs/Makefile.am
index 61ddc0f..957a931 100644
--- a/docs/Makefile.am
+++ b/docs/Makefile.am
@@ -1,48 +1,53 @@
 # Copyright (C) 2010 Red Hat, Inc.
 #
 # Authors: Angus Salkeld <asalkeld@redhat.com>
 #
 # This file is part of libqb.
 #
 # libqb is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Lesser General Public License as published by
 # the Free Software Foundation, either version 2.1 of the License, or
 # (at your option) any later version.
 #
 # libqb is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU Lesser General Public License for more details.
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with libqb.  If not, see <http://www.gnu.org/licenses/>.
 
 MAINTAINERCLEANFILES	= Makefile.in
 EXTRA_DIST 		= man.dox html.dox
 noinst_HEADERS          = mainpage.h
 
 dist_man_MANS = man8/qb-blackbox.8
 if HAVE_DOXYGEN
 inc_dir = $(top_srcdir)/include/qb
-dependent_headers = $(wildcard $(inc_dir)/qb*.h)
+
+dependent_headers = $(subst $(inc_dir),,$(shell \
+	printf 'include $(inc_dir)/Makefile.am\n\n%%.var:\n\t@echo $$($$*)' \
+	| ${MAKE} --no-print-directory -f - inst_HEADERS.var \
+	|| echo $(inc_dir)/qb*.h))
+
 dist_man_MANS += man3/qbipcc.h.3 man3/qbipcs.h.3 man3/qbatomic.h.3 \
 		 man3/qbhdb.h.3 man3/qbipc_common.h.3 man3/qblist.h.3 \
 		 man3/qbloop.h.3 man3/qbutil.h.3 man3/qbarray.h.3 \
 		 man3/qblog.h.3 man3/qbmap.h.3
 
 
-$(dist_man_MANS): man.dox $(dependent_headers)
+$(dist_man_MANS): man.dox $(dependent_headers:%=$(inc_dir)/%)
 	mkdir -p man3
 	doxygen man.dox
 
 doxygen: html.dox
 	mkdir -p html
 	doxygen html.dox
 
 else
 doxygen:
 	@echo WARNING: no doxygen to build man pages!
 endif
 
 clean-generic:
 	rm -rf html man3