I have had great problem compiling RFBEE sources (version 1.1). I have rewritten the source to pure C (from arduino C++). If anyone is interested you can find my sources here:
I believe that my FW uses less ram than arduino alternative. I have also fixed few bugs, that caused reboots and/or sw failures. Feel free to test, any feedback appreciated
Current version compiles fine using avr-gcc, some changes to Makefile might be necessary.