I've uploaded a new cross-build toolkit for OS X machines:
You can find sources for all libraries involved here:
I will be updating the cross-build instructions on the sf wiki soon
to reflect how I created this.
This is a static-compile toolchain; so to build Aleph One, you will
have to set LIBS="-ljpeg -lpng -lz -lsmpeg -lstdc++ -lws2_32" before
cross-configuring. Building will result in an AlephOne.exe that
requires no DLLs to run :)