I am trying to build yhc from source but I get stuck at this error: gcc -Wall -I. -c -o src/runtime/BCKernel/pretty.o src/runtime/BCKernel/pretty.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/pretty.c:1: src/runtime/BCKernel/platform.h:103:17: error: ffi.h: Arquivo ou diretório não encontrado (Last message means roughly 'ffi.h: File or directory not found') I got the source from the repo via darcs get and already tried to build both using scons and make. The message above was presented while trying to build via scons, but the make message is very similar. Is ffi.h some header file that I was supposed to have? This smells like my machine is somehow messed up. What should I check in my environment besides the dependencies outlined on the readme.txt? Thanks in advance, Thiago Arrais