Aimed to be a debugger for the GB/GBC (such FCEUX for NES).
Don't know if I will finished this project one day, only works with simple homemade game for now.
You will need SDL2 lib.
You will need "DMG_ROM.bin", the firmware of the Gameboy DMG to run the emulator. Checkout this link to get more information : http://gbdev.gg8.se/wiki/articles/Gameboy_Bootstrap_ROM