diff -rup ircservices-5.1.13-orig/configure ircservices-5.1.13/configure
--- ircservices-5.1.13-orig/configure	2008-01-06 01:17:39.000000000 +0100
+++ ircservices-5.1.13/configure	2008-11-09 15:25:23.000000000 +0100
@@ -163,7 +163,7 @@ test_function () {
     if [ ! "$proto" ] ; then
         proto="(...)"
     fi
-    func2=`echo $func | tr '[a-z]' '[A-Z]'`
+    func2=`echo $func | LC_ALL=C tr '[a-z]' '[A-Z]'`
     if [ ! "$TEST" ] ; then
         TEST="return 0;"
     fi