The Tcl and Tk source repositories can be found at

   * http://core.tcl.tk/tcl
   * http://core.tcl.tk/tk

The version control system used for these is [Fossil].

The remainder of this page follows Fossil's generic [http://www.fossil-scm.org/index.html/doc/trunk/www/quickstart.wiki%|%Quickstart Guide], modified to suit Tcl/Tk development.

**Installation**

Prebuilt binaries for the major platforms (Linux, OSX, Windows, BSD) are available at http://www.fossil-scm.org/download.html
[http://www.fossil-scm.org/index.html/doc/trunk/www/build.wiki%|%Building it yourself] is of course possible as well.

**General Work Flow**

Fossil works with repository files (a database with the project's complete history) and with checked-out local trees (the working directory you use to do your work). The workflow for Tcl and Tk looks like this:

First, clone the repository

======
fossil clone http://mirror1.tcl.tk/tcl tcl.fossil
fossil clone http://mirror1.tcl.tk/tk  tk.fossil
======

We are using mirror1 because the repositories are large and http://core.tcl.tk/ is bandwidth-limited.

Then create local checkouts to work with (using Tcl as example):

======
mkdir /somewhere/tcl
cd    /somewhere/tcl
fossil open /wherever/you/have/tcl.fossil
======

Now you have the most recent revision of Tcl's trunk (ex-CVS HEAD) in the directory. Hacking can commence.

For those which have worked on the core before, using CVS, please see the [Fossil vs CVS Commands].


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