Error compiling MSSQL for Win32

It's probably me but I get this nasty error when compiling the latest CVS using VC++6 on Win2000 Server. Any clues as to the cause/solution? (Apologies for line wraps) --------------------Configuration: mssql - Win32 MSSQL 65 Release_TS------------ -------- Compiling... php_mssql.c D:\php\php4\ext\mssql\php_mssql.c(73) : error C2065: 'ZEND_DEBUG' : undeclared identifier D:\php\php4\ext\mssql\php_mssql.c(73) : error C2099: initializer is not a constant D:\php\php4\ext\mssql\php_mssql.c(74) : warning C4305: 'initializing' : truncation from 'const int ' to 'unsigned char ' D:\php\php4\ext\mssql\php_mssql.c(1433) : error C2059: syntax error : '=' D:\php\php4\ext\mssql\php_mssql.c(1438) : error C2059: syntax error : 'switch' D:\php\php4\ext\mssql\php_mssql.c(1464) : error C2065: 'result' : undeclared identifier D:\php\php4\ext\mssql\php_mssql.c(1464) : error C2223: left of '->data' must point to struct/union D:\php\php4\ext\mssql\php_mssql.c(1464) : error C2065: 'row' : undeclared identifier D:\php\php4\ext\mssql\php_mssql.c(1464) : error C2100: illegal indirection D:\php\php4\ext\mssql\php_mssql.c(1464) : error C2223: left of '->value' must point to struct/union D:\php\php4\ext\mssql\php_mssql.c(1464) : fatal error C1903: unable to recover from previous error(s); stopping compilation