Copied makefile from unixio.mak. Make fails with 1 error (and warnings).
Added compile artifacts (ckifzs, jzexe) to git ingore list
Corrected compile error in osdepend.c

Changed type of const char *optarg to char *optarg.
Compiled w/ no errors (and many warnings).
Tested w/ Zork data file: *OK*
Removed -DHARD_COLORS flag from makefile. Now compiles to use native shell color scheme.