Ok, I installed Git, now the command works. Currently cloning... and finally installing dependencises... and I received these erros:

It also ask me now for a redis database name. What should I write for it?

npm WARN deprecated lodash@0.9.2: lodash@<2.0.0 is no longer maintained. Upgrade to lodash@^3.0.0
npm WARN deprecated lodash@1.0.2: lodash@<2.0.0 is no longer maintained. Upgrade to lodash@^3.0.0

bufferutil@1.2.1 install /Users/Dakoom/NodeBB/node_modules/bufferutil
node-gyp rebuild

xcode-select: error: tool 'xcodebuild' requires Xcode, but active developer directory '/Library/Developer/CommandLineTools' is a command line tools instance

xcode-select: error: tool 'xcodebuild' requires Xcode, but active developer directory '/Library/Developer/CommandLineTools' is a command line tools instance

CXX(target) Release/obj.target/bufferutil/src/bufferutil.o
SOLINK_MODULE(target) Release/bufferutil.node

utf-8-validate@1.2.1 install /Users/Dakoom/NodeBB/node_modules/utf-8-validate
node-gyp rebuild

xcode-select: error: tool 'xcodebuild' requires Xcode, but active developer directory '/Library/Developer/CommandLineTools' is a command line tools instance

xcode-select: error: tool 'xcodebuild' requires Xcode, but active developer directory '/Library/Developer/CommandLineTools' is a command line tools instance

CXX(target) Release/obj.target/validation/src/validation.o
SOLINK_MODULE(target) Release/validation.node

heapdump@0.3.7 install /Users/Dakoom/NodeBB/node_modules/heapdump
node-gyp rebuild

xcode-select: error: tool 'xcodebuild' requires Xcode, but active developer directory '/Library/Developer/CommandLineTools' is a command line tools instance

xcode-select: error: tool 'xcodebuild' requires Xcode, but active developer directory '/Library/Developer/CommandLineTools' is a command line tools instance

CXX(target) Release/obj.target/addon/src/heapdump.o
SOLINK_MODULE(target) Release/addon.node

EDIT: Ok, installed. Then I suppose that when I entered the db name it automatically created it. Ok, I have it installed and I'll try it a little bit! Thank you all for your suggestions!

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Glauco Zega