That is totally untrue. Nearly all build-based commercial games had extra things added that Ken Silverman didn't code; Duke Nukem is no exception.
Duke Nukem is based on build; the same problems of endianness and x86 assembler exist porting just Build or the Duke Nukem version of build, the difference is that when you've ported build, you THEN have to add all the Duke Nukem enhancements.
So, its actually harder to port build and get it to play Duke Nukem than it is just to port Duke Nukem.
