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# Hacking on the GN binary itself
## Building GN itself
GN is part of the Chromium tree, in [//tools/gn/](../). If you have a
Chromium checkout, you already have the source and you can do `ninja -C
out/Debug gn` to build it.
To build gn using gn, run (in the root `src` directory):
```
gn gen out/Default
ninja -C out/Default gn
```
Change `out/Default` as necessary to put the build directory where you
want.
## Running GN's unit tests
```
ninja -C out/Default gn_unittests && out/Default/gn_unittests
```
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