Only run xmlto once

Signed-off-by: Tim Waugh <[email protected]>

Author: twaugh

Makefile.am

@@ -30,12 +30,15 @@ src_rediff_LDADD = @LIBOBJS@
 
 if HAVE_XMLTO
 # The man pages are generated from DocBook XML.
-man_MANS = doc/interdiff.1 doc/filterdiff.1 doc/fixcvsdiff.1 doc/rediff.1 \
+interdiff_manpage = doc/interdiff.1
+other_manpages = doc/filterdiff.1 doc/fixcvsdiff.1 doc/rediff.1 \
 	doc/editdiff.1 doc/combinediff.1 doc/lsdiff.1 doc/splitdiff.1 \
 	doc/grepdiff.1 doc/recountdiff.1 doc/unwrapdiff.1 doc/dehtmldiff.1 \
 	doc/flipdiff.1 doc/espdiff.1 doc/patchview.1
+man_MANS = $(interdiff_manpage) $(other_manpages)
 
-$(man_MANS): doc/patchutils.xml
+$(other_manpages): $(interdiff_manpage)
+$(interdiff_manpage): doc/patchutils.xml
 	$(XMLTO) man -o doc $<
 endif