You can't.
Developing ReactOS
It's very simple to get involved with the development of ReactOS. The development team members are not part of some exclusive club with strict policies, so getting your code into the ReactOS codebase is straightforward. The only prerequisite is that you have not had access to Microsoft source code for the area you would be interested in working on. This includes any route in which you may have been exposed, whether it be via some student program or through illegally downloading leaked MS source code. Having viewed the source deems you as being tainted, and as such you may hinder the legality of the source which the ReactOS teams enforces every effort to keep clean.
If like most developers, the above doesn't apply to you, consider yourself clean and eligible to write code for ReactOS.
>From here: http://www.reactos.org/en/dev_start.html
Date: Sat, 16 May 2009 22:43:16 +0800
From: gxm.reactos@gmail.com
To: ros-dev@reactos.org
Subject: [ros-dev] I want to develop the kernel of ReactOS, how do i join????
Hi guys:
I have read the linux kernel code and part of the leaked winnt source code,and i want to join the developing of ReactOS kernel,how can i join??
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