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));