+dnl po4a for translating man pages and POD files (optional).
+AC_CHECK_PROG([PO4A],[po4a],[po4a],[no])
+AM_CONDITIONAL([HAVE_PO4A], [test "x$PO4A" != "xno"])
+
+dnl PHP
+AC_CHECK_PROG([PHP],[php],[php],[no])
+AC_CHECK_PROG([PHPIZE],[phpize],[phpize],[no])
+AM_CONDITIONAL([HAVE_PHP], [test "x$PHP" != "xno" -a "x$PHPIZE" != "xno"])
+