I don't use external merge tools.
--- a/.hgrc Wed Jan 15 19:28:16 2014 +0200
+++ b/.hgrc Wed Jan 15 19:29:22 2014 +0200
@@ -25,9 +25,6 @@
ignorewsamount = True
ignoreblanklines = True
-[merge-tools]
-emacs.args = -q --eval "(ediff-merge-with-ancestor \"$local\" \"$other\" \"$base\" nil \"$output\")"
-
[web]
encoding = utf-8