ignore autogenerated m4 stuff
diff --git a/.gitignore b/.gitignore
index de8dd0f..da42ba2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -18,6 +18,7 @@
 Makefile
 Makefile.in
 ylwrap
+m4/*
 
 # Generated by `./configure`
 config.h