What version of stuff do I have?

gistfile1.txt

# Check for Python
python --version

# Check for node.js on Linux
nodejs --version

# Check for node.js on Windows
node --version

//source: http://kripken.github.io/emscripten-site/docs/building_from_source/toolchain_what_is_needed.html#toolchain-test-which-dependencies-are-installed

# Check for node.js on Mac OS X
node -v

# Check for git
git --version

# Check for Java
java -version

# Check for gcc / g++
gcc --version
g++

# Check for cmake
cmake

# Check your version of Ruby
ruby -v

# Check which version of node package manager.
npm -v

# Install ffmpeg
brew install ffmpeg $(brew options ffmpeg | grep -vE '\s' | grep -- '--with-' | tr '\n' ' ')
source: https://gist.github.com/Piasy/b5dfd5c048eb69d1b91719988c0325d8#gistcomment-2571754