PHP_ARG_ENABLE([sysvsem],
  [whether to enable System V semaphore support],
  [AS_HELP_STRING([--enable-sysvsem],
    [Enable System V semaphore support])])

if test "$PHP_SYSVSEM" != "no"; then
  PHP_NEW_EXTENSION(sysvsem, sysvsem.c, $ext_shared)
  AC_DEFINE(HAVE_SYSVSEM, 1, [ ])
  AC_CHECK_TYPES([union semun],,,[#include <sys/types.h>
    #include <sys/ipc.h>
    #include <sys/sem.h>])
fi