This is a small package so you can compile programs using IA-16 GCC without installing the full DJGPP environment. It contains two files: DJGPP.ENV SETENV.BAT The DJGPP.ENV file just sets an empty DJDIR variable. This variable doesn't actually do anything in IA-16 GCC, but you can't compile programs without the DJGPP.ENV file present. The SETENV.BAT file sets up the environment, pointing the DJGPP environment variable to the DJGPP.ENV file, and updating the PATH to use IA-16 GCC.