Install Homebrew if you haven't already. Then:

# Install CMake (needed to build GLFW)
brew install cmake

# Install FFTW
brew install fftw

# Install GLFW
curl https://codeload.github.com/glfw/glfw/zip/3.0.4 -o glfw-3.0.4.zip
unzip glfw-3.0.4.zip
cd glfw-3.0.4
cmake .
make
make install # MAY NEED SUDO

# Install libsndfile
brew install libsndfile

# Install PortAudio
brew install portaudio

# Install PortMidi
brew install portmidi

• FFTW: http://www.fftw.org
• GLFW: http://www.glfw.org
• libsndfile: http://www.mega-nerd.com/libsndfile
• PortAudio: http://www.portaudio.com
• PortMidi: http://portmedia.sourceforge.net/portmidi

First install and start a MIDI synthesizer (like SimpleSynth). Then:

make

• Backend - Live analysis backend.
• GUI - Graphical user interface.
• Midi - MIDI output.
• Pitch - Pitch detection algorithms.
• Serial - Serial device communication.

• Main - Live pitch detection, visualization and MIDI output.
• *_test - Various component tests.

• Move onset / offset detection into backend.c.