You need to create a so-called "universal binary" that includes both PowerPC and x86 code. Beginning with OS X 10.3.9, such universal binaries then will run on both platforms.
There is a thread somewhere here describing how to create UBs. Basically, you need to compile your BlitzMax program on both platforms with the respective version and then "merge" the created binaries to one UB.
There is a thread somewhere here describing how to create UBs. Basically, you need to compile your BlitzMax program on both platforms with the respective version and then "merge" the created binaries to one UB.