[MLton-user] Re: can't build svn trunk from source

[Wesley W. Terpstra]

Recompiling MLton on windows is always a problem because it is unable  
to use the bootstrapping code that makes an old basis library  
compatible. The easiest solution is to a) use precompiled binaries or  
b) use a MLton newer than the last change to the basis to do the  
compile.

Unfortunately, it seems there is no experimental packages prepared  
lately for windows.

So I'd recommend:
1. Using linux where there is no bootstrapping problem
2. Getting your hands dirty and modifying the basis of the older  
compiler to get the newer one to bootstrap
3. Waiting till the next official release in the summer

For the specific problem you quoted, just expose a value tempPrefix =  
"/windows/temp" or something similar.