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+# Hacking
+
+## Getting the sources
+
+Git is required to hack on anything, you can set up a git clone of GYP
+as follows:
+
+```
+mkdir foo
+cd foo
+git clone git@github.com:nodejs/gyp-next.git
+cd gyp
+```
+
+(this will clone gyp underneath it into `foo/gyp`.
+`foo` can be any directory name you want. Once you've done that,
+you can use the repo like anything other Git repo.
+
+## Testing your change
+
+GYP has a suite of tests which you can run with the provided test driver
+to make sure your changes aren't breaking anything important.
+
+You run the test driver with e.g.
+
+``` sh
+$ python -m pip install --upgrade pip
+$ pip install --editable ".[dev]"
+$ python -m pytest
+```
+
+See [Testing](Testing.md) for more details on the test framework.
+
+Note that it can be handy to look at the project files output by the tests
+to diagnose problems. The easiest way to do that is by kindly asking the
+test driver to leave the temporary directories it creates in-place.
+This is done by setting the environment variable "PRESERVE", e.g.
+
+```
+set PRESERVE=all     # On Windows
+export PRESERVE=all  # On saner platforms.
+```
+
+## Reviewing your change
+
+All changes to GYP must be code reviewed before submission.