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# Building `git-sizer` from source
Most people can just install a released version of `git-sizer`, [as described in the `README.md`](../README.md#getting-started). However, if you want to test a non-release version, or if you might want to contribute to `git-sizer`, you can also build it from source.
## Build and install using `go get`
1. Make sure that you have a recent version of the [Go language toolchain](https://golang.org/doc/install) installed and that you have set `GOPATH`.
2. Get `git-sizer` using `go get`:
go get github.com/github/git-sizer
This should fetch and compile the source code and write the executable file to `$GOPATH/bin/`.
3. Either add `$GOPATH/bin` to your `PATH`, or copy the executable file (`git-sizer` or `git-sizer.exe`) to a directory that is already in your `PATH`.
## Build using `make`
This procedure is intended for experts and people who want to help develop `git-sizer`. It should work on Linux or OS X. On other Unix-like systems, this procedure is also likely to work, provided you first [install Go manually](https://golang.org/doc/install).
1. Clone the `git-sizer` Git repository and switch to that directory:
git clone https://github.com/github/git-sizer.git
cd git-sizer
2. Install Go if necessary:
script/bootstrap
3. (Optional) Run the automated tests:
make test
4. Build `git-sizer`:
make
If you have a C toolchain set up, you can enable support for `isatty()` (which turns off `--progress` by default if output is not to a TTY) by running
make USE_ISATTY=true
5. Copy the resulting executable file (`bin/git-sizer`) to a directory in your `PATH`.
It is also possible to cross-compile for other platforms that are supported by Go. See the comments in the `Makefile` for more information.
## Making a release
See [`RELEASING.md`](RELEASING.md).
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