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Build CoreCLR on OS X
=====================
This guide will walk you through building CoreCLR on OS X. We'll start by showing how to set up your environment from scratch.
Environment
===========
These instructions were validated on OS X Yosemite, although they probably work on earlier versions. Pull Requests are welcome to address other environments.
If your machine has Command Line Tools for XCode 6.3 installed, you'll need to update them to the 6.3.1 version or higher in order to successfully build. There was an issue with the headers that shipped with version 6.3 that was subsequently fixed in 6.3.1.
Git Setup
---------
Clone the CoreCLR and CoreFX repositories (either upstream or a fork).
```sh
dotnet-mbp:git richlander$ git clone https://github.com/dotnet/coreclr
# Cloning into 'coreclr'...
dotnet-mbp:git richlander$ git clone https://github.com/dotnet/corefx
# Cloning into 'corefx'...
```
This guide assumes that you've cloned the coreclr and corefx repositories into `~/git/coreclr` and `~/git/corefx` on your OS X machine. If your setup is different, you'll need to pay careful attention to the commands you run. In this guide, I'll always show what directory I'm in.
CMake
-----
CoreCLR has a dependency on CMake for the build. You can download it from [CMake downloads](http://www.cmake.org/download/).
Alternatively, you can install CMake from [Homebrew](http://brew.sh/).
```sh
dotnet-mbp:~ richlander$ brew install cmake
```
ICU
---
ICU (International Components for Unicode) is also required to build and run. It can be obtained via [Homebrew](http://brew.sh/).
```sh
brew install icu4c
brew link --force icu4c
```
OpenSSL
-------
The CoreFX cryptography libraries are built on OpenSSL. The version of OpenSSL included on OS X (0.9.8) has gone out of support, and a newer version is required. A supported version can be obtained via [Homebrew](http://brew.sh).
```sh
brew install openssl
brew link --force openssl
```
Build the Runtime and Microsoft Core Library
============================================
To Build CoreCLR, run build.sh from the root of the coreclr repo.
```sh
dotnet-mbp:~ richlander$ cd ~/git/coreclr
dotnet-mbp:coreclr richlander$ ./build.sh
```
After the build is completed, there should some files placed in `bin/Product/OSX.x64.Debug`. The ones we are interested in are:
- `corerun`: The command line host. This program loads and starts the CoreCLR runtime and passes the managed program you want to run to it.
- `libcoreclr.dylib`: The CoreCLR runtime itself.
- `mscorlib.dll`: Microsoft Core Library.
Build the Framework
===================
```sh
dotnet-mbp:corefx richlander$ ./build.sh
```
After the build is complete you will be able to find the output in the `bin` folder.
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