diff --git a/.gitignore b/.gitignore
index eba46ff1..bd267bd2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -42,6 +42,13 @@ libevent.pc
 ## The initial / makes these files only get ignored in particular directories.
 /autom4te.cache
 
+# Libtool adds these, at least sometimes
+/m4/libtool.m4
+/m4/ltoptions.m4
+/m4/ltsugar.m4
+/m4/ltversion.m4
+/m4/lt~obsolete.m4
+
 /aclocal.m4
 /compile
 /config.guess