Put flip somewhere in your $PATH and chmod a+x it.
Copy fuck into ~/.bashrc.
FASTBuild is an open-source distributed build system, which could be a free alternative to Incredibuild. Unreal Engine 4 (UE4) does not support FASTBuild natively, however it's not hard to integrate it manually.
We assume you already have the full UE4 source code. First you'll need to grab the latest FASTBuild tools from here. We use v0.93 Windows x64 version in this tutorial. Download it and extract all the files. Here you have several choices:
PATH environment variable. To see where these folders are, run the PATH command in a command prompt window;Engine\Binaries\ThirdParty\FASTBuild folder of your engine. This is the recommended place;