i didn't recognize _getds from anywhere so assumed it was something
commented out for a reason, but turns out that it was part of the
original modplayer code (which was originally written for watcom
anyway). _getds is an internal function from the watcom standard
libraries.
sources taken from book CD:
ack_lib -> /ACK/WIN/ACK_LIB
fdemo -> /ACK/DOS/FDEMO/SOURCE (and /ACK/DOS/BORLAND as needed)
mall -> /ACK/DOS/MALL/SOURCE (and /ACK/DOS/BORLAND as needed)
some source files were missing for the demo projects and needed to be
copied from /ACK/DOS/BORLAND (as indicated above)