Auto merge of #23819 - larsbergstrom:update_windows_readme, r=jdm

Fix Python and gstreamer instructions for Windows

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Improved the README.md to address missing information for bootstrapping a Windows build.

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bors-servo 2019-07-21 00:22:47 -04:00 committed by GitHub
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@ -209,9 +209,12 @@ export LIBCLANG_PATH=$(llvm-config --prefix)/lib64
```
#### On Windows (MSVC)
1. Install Python for Windows (https://www.python.org/downloads/release/python-2716/). The Windows x86-64 MSI installer is fine.
1. Install Python 2.7 for Windows (https://www.python.org/downloads/release/python-2716/). The Windows x86-64 MSI installer is fine. This is required for the build system execution and many dependencies.
You should change the installation to install the "Add python.exe to Path" feature.
2. Install Python 3.7 for Windows (https://www.python.org/downloads/release/python-374/). The Windows x86-64 MSI installer is fine. This is required in order to build the JavaScript engine, SpiderMonkey.
2. Install virtualenv.
In a normal Windows Shell (cmd.exe or "Command Prompt" from the start menu), do:
@ -222,6 +225,8 @@ pip install virtualenv
3. Install the most recent [GStreamer](https://gstreamer.freedesktop.org/data/pkg/windows/) development package following [these instructions](https://github.com/sdroege/gstreamer-rs#gstreamer-binaries-1). You will also need to add `C:\gstreamer\1.0\x86_64\lib` to your `LIB` environment variable.
Note that you should ensure that _all_ components are installed from gstreamer, as we require many of the optional libraries that are not installed by default.
4. Install Git for Windows (https://git-scm.com/download/win). DO allow it to add git.exe to the PATH (default
settings for the installer are fine).