I create my own versions because I don't want to be forced to update all dependencies freely when I just want to update fluentnhibernate.
The ruby installation is loaded and clicked on one exe, and the rake utility is included in the free nhibernate storage. This does not require you to read any manual or have any ruby knowledge. It does not take you more than 2 minutes.
Many .net projects use rake instead of nant or msbuild because ruby language syntax is easier to read than xml.
You can download the executables you want to use on the build server, which is used freely by nhibernate
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