Here are instructions for compiling CORTEX that worked for me with version 5.95 of the code. Note that paths may vary on your system, and you may have different results if you use different operating systems or compiler versions.
Instructions for Compiling CORTEX 5.95
SET PATH=%PATH%;C:\WATCOM\BINW;C:\WATCOM\BINNT SET INCLUDE=C:\WATCOM\H;C:\WATCOM\MFC\INCLUDE;C:\WATCOM\H\NT SET WATCOM=C:\WATCOM SET EDPATH=C:\WATCOM\EDDAT
C:\mssdk\include C:\Program Files\DevStudio\VC\INCLUDE C:\Program Files\DevStudio\VC\MFC\include C:\Program Files\DevStudio\VC\ATL\include C:\CORTEX\DXSOURCE\INCLUDE C:\CORTEX\SOURCE\INCLUDE c:\Cortex\DXsource\dxgdp c:\Cortex\source\remcort C:\Cortex\dxsource\lib32msc C:\Cortex\dxsource\sound C:\dxmedia\include C:\WATCOM\H C:\WATCOM\MFC\INCLUDE C:\WATCOM\H\NT
C:\mssdk\lib C:\Program Files\DevStudio\VC\LIB C:\Program Files\DevStudio\VC\MFC\lib C:\CORTEX\DXSOURCE\LIB32MSC C:\dxmedia\lib
dsbdesc.dwFlags = DSBCAPS_STATIC | // just make it a static buffer
DSBCAPS_CTRLDEFAULT |
DSBCAPS_GETCURRENTPOSITION2 |
DSBCAPS_GLOBALFOCUS;