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The union semun is always defined in php-src code. Current systems require user to define it manually as done in the ext/sysvsem/sysvsem.c. The conditional checks for HAVE_SEMUN were unused. The PHP 3.0.12 AIX bug bugs.php.net/2149 was fixed by the removal of __GNU_LIBRARY__ check, so this now further simplifies the code. The Autoconf AC_CHECK_TYPES checks if system by any chance has the union semun, and by default defines the HAVE_UNION_SEMUN.