I get errors linking scheme with ld after (successfully) compiling,
because scheme libraries are i386 but g++ seems to compile natively
to x86_64.
unfortunately forcing g++ to compile in 32-bit won't work either,
because all macports libraries are 64-bit. without a 64-bit scheme
library it would be quite cumbersome to compile fluxus on 10.6, because
you need to compile all dependencies by hand to 32-bit.
one thing you can try is compiling against the PLT MzScheme framework
instead of the PLT_MrEd framework.
best,
gabor