In sapi/apache/mod_php4.c the following code has a silly error:
                if (elts[i].val) {
                        val = elts[i].val;
                        if (!strcmp(val, "SCRIPT_FILENAME")) {
                                script_filename = val;
                        }


This is comparing the env value instead of the key, thus
$PATH_TRANSLATED won't work; it
should be
if (!strcmp(elts[i].key, "SCRIPT_FILENAME")) {


Paul Gregg.