fallback to docbook2man if no docbook-to-man available
diff --git a/man/Makefile.am b/man/Makefile.am
index 747e418..ed0246e 100644
--- a/man/Makefile.am
+++ b/man/Makefile.am
@@ -16,7 +16,7 @@
 #  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 
 flac.1: flac.sgml
-	docbook-to-man $< > $@
+	docbook-to-man $< > $@ || docbook2man $< > $@
 
 man_MANS = flac.1