AC_DEFUN([DOVECOT_PR_SET_DUMPABLE], [
  AC_CACHE_CHECK([whether PR_SET_DUMPABLE exists],i_cv_have_pr_set_dumpable,[
    AC_TRY_LINK([
      #include <sys/prctl.h>
    ], [
      prctl(PR_SET_DUMPABLE, 1, 0, 0, 0);
    ], [
      i_cv_have_pr_set_dumpable=yes
    ], [
      i_cv_have_pr_set_dumpable=no
    ])
  ])
  if test $i_cv_have_pr_set_dumpable = yes; then
    AC_DEFINE(HAVE_PR_SET_DUMPABLE,, [Define if you have prctl(PR_SET_DUMPABLE)])
  fi
])