diff --git a/m4/.gitignore b/m4/.gitignore
new file mode 100644
index 0000000..d1cc719
--- /dev/null
+++ b/m4/.gitignore
@@ -0,0 +1,4 @@
+# Ignore All, except pkg.m4, and of course this file.
+*
+!.gitignore
+!pkg.m4