Just for the record, there is a second machine I tried to build on and couldn't. I will try a third one also. This one is a i686/i386 GNU/Linux Ubuntu Dapper Drake box. I tried basically the same thing that I tried on the Fedora box: darcs get the repo, install scons (since i didn't have it previously) and then `scons build'. The error is pretty much the same that ocurred on the Fedora box earlier: gcc -Wall -I. -c -o src/runtime/BCKernel/external.o src/runtime/BCKernel/external.c In file included from src/runtime/BCKernel/types.h:5, from src/runtime/BCKernel/hashtable.h:4, from src/runtime/BCKernel/module.h:18, from src/runtime/BCKernel/external.h:4, from src/runtime/BCKernel/external.c:1: src/runtime/BCKernel/platform.h:103:17: error: ffi.h: No such file or directory Thanks, Thiago Arrais