Makefile.m4: Make the LaTeX documnt be optional.

diff --git a/Makefile.m4 b/Makefile.m4
index 75c33a56d7edfedefdd0dbd093b16f2054ca8c9a..eee02913cd9a1acf3d35dcbaf0b6cb4dcc1275b1 100644 (file)
--- a/Makefile.m4
+++ b/Makefile.m4
@@ -64,7 +64,8 @@ m4_divert(20)
 ###--------------------------------------------------------------------------
 ### Rules
 
-all: $(ALL_ZONE_FILES) $(DOC_OUTPUTS)
+all: $(ALL_ZONE_FILES)
+doc: $(DOC_OUTPUTS)
 
 install: all
        ##