--- a/aclocal.m4
+++ b/aclocal.m4
@@ -1,15 +1,14 @@
 dnl
 dnl Local autoconf macros used with mozilla
 dnl The contents of this file are under the Public Domain.
 dnl 
 
 builtin(include, mozilla/build/autoconf/glib.m4)dnl
-builtin(include, mozilla/build/autoconf/libIDL.m4)dnl
 builtin(include, mozilla/build/autoconf/nspr.m4)dnl
 builtin(include, mozilla/build/autoconf/nss.m4)dnl
 builtin(include, mozilla/build/autoconf/pkg.m4)dnl
 builtin(include, mozilla/build/autoconf/freetype2.m4)dnl
 builtin(include, mozilla/build/autoconf/codeset.m4)dnl
 builtin(include, mozilla/build/autoconf/altoptions.m4)dnl
 builtin(include, mozilla/build/autoconf/mozprog.m4)dnl
 builtin(include, mozilla/build/autoconf/acwinpaths.m4)dnl