In the file server/protocol.c (line 983 in httpd-2.0.49) the function void ap_set-sub_req_protocol(request_rec *rnew, const request_rec *r) is not exported on win32 builds of apache..
a AP_DECLARE needs to be wrapped around void AP_DECLARE(void) ap_set-sub_req_protocol(request_rec *rnew, const request_rec *r) I am using this function in my mod_ftpd module http://www.outoforder.cc/projects/apache/mod_ftpd/.
