PHP_ARG_ENABLE([sysvshm],
  [whether to enable System V shared memory support],
  [AS_HELP_STRING([--enable-sysvshm],
    [Enable the System V shared memory support])])

if test "$PHP_SYSVSHM" != "no"; then
  AC_DEFINE([HAVE_SYSVSHM], [1],
    [Define to 1 if the PHP extension 'sysvshm' is available.])
  PHP_NEW_EXTENSION([sysvshm], [sysvshm.c], [$ext_shared])
fi