https://github.com/espressif/esp-idf/blob/master/docs/get-started/windows-setup.rst
The quick setup is to download the Windows all-in-one toolchain & MSYS zip file from dl.espressif.com:
esp32_win32_msys2_environment_and_toolchain-20170918.zip
Unzip the zip file to C:\ (or some other location, but this guide assumes C:\) and it will create an msys32 directory with a pre-prepared environment.
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