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---
layout: documentation
title: Compile Bazel from Source
---
# <a name="compiling-from-source"></a>Compile Bazel from source
You can build Bazel from source following these steps:
1. Ensure that JDK 8, Python, bash, zip, and the usual C build toolchain
are installed on your system.
* On systems based on Debian packages (Debian, Ubuntu): you can install
OpenJDK 8 and Python by running the following command in a terminal:
```sh
sudo apt-get install build-essential openjdk-8-jdk python zip
```
* On Windows: you need additional software. See the [requirements
page](windows.html#requirements).
2. Download and unpack Bazel's distribution archive.
Download `bazel-<version>-dist.zip` from the [release
page](https://github.com/bazelbuild/bazel/releases). We recommend to also
verify the signature made by our [release
key](https://bazel.build/bazel-release.pub.gpg) 48457EE0.
The distribution archive contains generated files in addition to the
versioned sources, so this step _cannot_ be short cut by checking out the
source tree.
3. Build Bazel using `./compile.sh`.
* On Unix-like systems (e.g. Ubuntu, macOS), do the following steps in a
shell session:
1. `cd` into the directory where you unpacked the distribution archive
2. run `bash ./compile.sh`
* On Windows, do following steps in the msys2 shell:
1. `cd` into the directory where you unpacked the distribution archive
2. run `./compile.sh`
The output will be `output/bazel` on Unix-like systems (e.g. Ubuntu, macOS)
and `output/bazel.exe` on Windows. This is a self-contained Bazel binary.
You can copy it to a directory on the `PATH` (such as `/usr/local/bin` on
Linux) or use it in-place.
## Note to Windows users
Make sure your machine meets the [requirements](windows.html) and that you use
the latest version of the sources (`bazel-0.X.Y-dist.zip`).
There's a bug in the compilation scripts in `bazel-0.6.0-dist.zip` and in
`bazel-0.6.1-dist.zip`:
To fix it:
* either apply the changes in
[e79a110](https://github.com/bazelbuild/bazel/commit/e79a1107d90380501102990d82cbfaa8f51a1778)
to the source tree,
* or just replace the following line in
`src/main/native/windows/build_windows_jni.sh`:
```sh
@CL /O2 /EHsc /LD /Fe:"$(cygpath -a -w ${DLL})" /I "${VSTEMP}" /I . ${WINDOWS_SOURCES[*]}
```
with this line:
```sh
@CL /O2 /EHsc /LD /Fe:"$(cygpath -a -w ${DLL})" /I "%TMP%" /I . ${WINDOWS_SOURCES[*]}
```
It suffices to do one of these to bootstrap Bazel. We however recommend
applying the full commit (e79a110) because it also adds extra environment
checks to `./compile.sh`.
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