In case it's useful, LambdaNative supports cross-compiling Gambit Scheme apps using the OpenWrt SDKs (tested on one of the MIPS targets from the Attitude Adjustment (12.09) release).
Chris
Thanks. It looks like an interesting project. I did not manage to get it up & running though, I can't remember right now why.
In the meantime I have found a way to cross compile scheme apps. When running gsc with -exe and -verbose, it will print out the gcc command lines it uses. It looks like I was missing -lutil -ldl -lm. The complete command line looks like this (not including all the optimization options):