diff -up libical-1.0/scripts/mkderivedvalues.pl.sort libical-1.0/scripts/mkderivedvalues.pl
--- libical-1.0/scripts/mkderivedvalues.pl.sort	2013-11-21 14:46:33.330067572 +0100
+++ libical-1.0/scripts/mkderivedvalues.pl	2013-11-21 14:46:47.037211733 +0100
@@ -63,7 +63,7 @@ if($opt_h){
   print "typedef enum icalvalue_kind {\n";
   print "   ICAL_ANY_VALUE=$idx,\n";
 
-  foreach $value  (keys %h) {
+  foreach $value  (sort keys %h) {
     
     $idx++;
     my $ucv = join("",map {uc(lc($_));}  split(/-/,$value));