Re: Heart of the Alien: How to compile.
I'll ask him next time I speak to him about the sources.
As for whether or not it was difficult, both me and him were both starting to learn around that time and would often exchange war stories (our attempts at compiling things) and the main issue I recall him having were endian based. This would suggest an x86 AROS port may be a little easier than 68k/ppc ports although being that at the time neither of us were gurus and he still managed I dont expect it'd be too difficult.
As for differences in dev environments, theyre not drastically different. Learn the basic theory for one and its just a matter of learning the subtle differences in the sdks. This goes double for software using things like SDL, where the hosts apis dont much influence things (in terms of compiling at least).