manifest.json

    {
      "toolchain-xtensa-lx106-elf": [
        {
          "system": ["windows", "windows_amd64", "windows_x86"],
          "url": "https://github.com/WallaceWilliam/xtensa-lx106-elf/raw/master/xtensa-lx106-elf-gcc8_4_0-esp-2020r3-win32.tar.gz",
          "version": "8.4.0+esp2020r3"
        },
        {
          "system": ["windows", "windows_amd64", "windows_x86"],
          "url": "https://github.com/WallaceWilliam/xtensa-lx106-elf/raw/master/xtensa-lx106-elf-win32-1.22.0-100-ge567ec7-5.2.0.tar.gz",
          "version": "5.2.0+100"
        },
        {
          "system": ["darwin_x86_64", "darwin_i386"],
          "url": "https://github.com/WallaceWilliam/xtensa-lx106-elf/raw/master/xtensa-lx106-elf-macos-1.22.0-100-ge567ec7-5.2.0.tar.gz",
          "version": "5.2.0+100"
        },
        {
          "system": ["windows", "windows_amd64", "windows_x86"],
          "url": "https://github.com/WallaceWilliam/xtensa-lx106-elf/raw/master/xtensa-lx106-elf-win32-1.22.0-92-ge567ec7-5.2.0.tar.gz",
          "version": "5.2.0+92"
        },
        {
          "system": ["darwin_x86_64", "darwin_i386"],
          "url": "https://github.com/WallaceWilliam/xtensa-lx106-elf/raw/master/xtensa-lx106-elf-osx-1.22.0-92-ge567ec7-5.2.0.tar.gz",
          "version": "5.2.0+92"
        }
      ]
    }