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opencv-cache.tar: Some third-party files that need to be downloaded when compiling opencv-4.9.0, based on Windows x64 and Linux x64.

.
├── linux
│   └── opencv-4.9.0
│       ├── build
│       │   ├── 3rdparty
│       │   └── downloads
│       └── .cache
└── windows
    └── opencv-4.9.0
        ├── build
        │   ├── 3rdparty
        │   └── downloads
        └── .cache