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## Building from source
Below are instructions on how to build Deno from source. If you just want to use
Deno you can download a prebuilt executable (more information in the
`Getting Started` chapter).
### Cloning the Repository
Clone on Linux or Mac:
```shell
git clone --recurse-submodules https://github.com/denoland/deno.git
```
Extra steps for Windows users:
1. [Enable "Developer Mode"](https://www.google.com/search?q=windows+enable+developer+mode)
(otherwise symlinks would require administrator privileges).
2. Make sure you are using git version 2.19.2.windows.1 or newer.
3. Set `core.symlinks=true` before the checkout:
```shell
git config --global core.symlinks true
git clone --recurse-submodules https://github.com/denoland/deno.git
```
### Prerequisites
You will need to [install Rust](https://www.rust-lang.org/tools/install). Make
sure to fetch the latest stable release as Deno does not support nightly builds.
Check that you have the required tools:
```
rustc -V
cargo -V
```
### Setup rust targets and components
```shell
rustup target add wasm32-unknown-unknown
rustup target add wasm32-wasi
```
### Building Deno
The easiest way to build Deno is by using a precompiled version of V8:
```
cargo build -vv
```
However if you want to build Deno and V8 from source code:
```
V8_FROM_SOURCE=1 cargo build -vv
```
When building V8 from source, there are more dependencies:
[Python 2](https://www.python.org/downloads). Ensure that a suffix-less
`python`/`python.exe` exists in your `PATH` and it refers to Python 2,
[not 3](https://github.com/denoland/deno/issues/464#issuecomment-411795578).
For Linux users glib-2.0 development files must also be installed. (On Ubuntu,
run `apt install libglib2.0-dev`.)
Mac users must have [XCode](https://developer.apple.com/xcode/) installed.
For Windows users:
1. Get [VS Community 2019](https://www.visualstudio.com/downloads/) with
"Desktop development with C++" toolkit and make sure to select the following
required tools listed below along with all C++ tools.
- Visual C++ tools for CMake
- Windows 10 SDK (10.0.17763.0)
- Testing tools core features - Build Tools
- Visual C++ ATL for x86 and x64
- Visual C++ MFC for x86 and x64
- C++/CLI support
- VC++ 2015.3 v14.00 (v140) toolset for desktop
2. Enable "Debugging Tools for Windows". Go to "Control Panel" → "Programs" →
"Programs and Features" → Select "Windows Software Development Kit - Windows
10" → "Change" → "Change" → Check "Debugging Tools For Windows" → "Change" ->
"Finish". Or use:
[Debugging Tools for Windows](https://docs.microsoft.com/en-us/windows-hardware/drivers/debugger/)
(Notice: it will download the files, you should install
`X64 Debuggers And Tools-x64_en-us.msi` file manually.)
See [rusty_v8's README](https://github.com/denoland/rusty_v8) for more details
about the V8 build.
### Building
Build with Cargo:
```shell
# Build:
cargo build -vv
# Build errors? Ensure you have latest master and try building again, or if that doesn't work try:
cargo clean && cargo build -vv
# Run:
./target/debug/deno run cli/tests/002_hello.ts
```
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