Linux

Linux dependencies. OSX users already have these after installing Xcode.

sudo apt-get install make gcc bison git python python-setuptools

Set up the pokered repository:

git clone git://github.com/iimarckus/pokered.git
cd pokered

./init.sh

Now pokered.gbc can be built from source.

make red

This should take about 10-15 seconds. Subsequent builds are faster.

To build Pokémon Blue:

make blue

OSX

Download and install Xcode. Then follow the Linux instructions.

Not yet.