Unresolved References - several wlink errors

Undefined Symbol                Referenced by
================                =============

MapAppToSFTHandle               rxdos.obj(..\src\rxdos.asm)
getActualDrive                  rxdosfcb.obj(..\src\Rxdosfcb.asm)
copyBlock                       rxdosfcb.obj(..\src\Rxdosfcb.asm)
LoadProgram                     rxdoslfn.obj(..\src\Rxdoslfn.asm)
FindAvailableSFThandle          rxdoslfn.obj(..\src\Rxdoslfn.asm)
getActualDrive                  rxdosstr.obj(..\src\Rxdosstr.asm)