Hi!
So I assume ubuntu 8 is using a more recent PHP than ubuntu 7.1 and defines that constant. My php -v says: PHP 5.2.3-1ubuntu6.3 (cli) (built: Jan 10 2008 09:38:37)
I think ICU stuff might be added to 5.2 branch after 5.2.3 You may want to d/l 5.2.6 from php.net and compare the acinclude.m4, or just see one on cvs.php.net in PHP_5_2 branch. I understand it's not as good as having it ready on your system, but 5.2.3 is year old now, and 5.2.6 is current, so I hope Ubuntu has some more up-to-date package...
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