AC_CHECK_LIB([acl], [acl_init], [:], AC_MSG_ERROR([libacl not found]))
AC_CHECK_HEADER([acl/libacl.h], [:], AC_MSG_ERROR([libacl header not found]))
AC_CHECK_LIB([acl], [acl_init], [:], AC_MSG_ERROR([libacl not found]))
AC_CHECK_HEADER([acl/libacl.h], [:], AC_MSG_ERROR([libacl header not found]))