Win32 compile error

When I try to build the mods I just downloaded, i get an error message that reads:

uilding Modules
Compiling:blitz_app.c
'gcc' is not recognized as an internal or external command,
operable program or batch file.
Build Error: failed to compile C:/unzipped/BlitzMaxBeta101/mod/brl.mod/blitz.mod/blitz_app.c
Process complete


Any idea why? How can I fix this...

Thanks.

-Spo-