If you've got the 64bit version of Ubuntu then you can build applications with BlitzMax but you will not be able to build any modules, as BlitzMax looks for GCC-3.3 tools/libs and unfortunately Ubuntu 64 doen't support the 32bit libs needed by BlitzMax (It would be nice if BRL updated BMAX to use GCC 4.1/4.2 so Ubuntu 64 users could use the Multilibs packages)