**Q: Pip install fails with``ModuleNotFoundError: No module named 'skbuild'``?**

Since``opencv-python`` version3.4.0.\*,``manylinux1`` wheels were replaced by``manylinux2014`` wheels. If your pip is too old, it will try to use the new source distribution introduced in 3.4.0.38 to manually build OpenCV because it does not know how to install``manylinux2014`` wheels. However, source build will also fail because of too old``pip`` because it does not understand build dependencies in``pyproject.toml``. To use the new``manylinux2014`` pre-built wheels (or to build from source), your``pip`` version must be >= 19.3. Please upgrade``pip`` with``pip install --upgrade pip``.

Since``opencv-python`` version4.3.0.\*,``manylinux1`` wheels were replaced by``manylinux2014`` wheels. If your pip is too old, it will try to use the new source distribution introduced in 3.4.0.38 to manually build OpenCV because it does not know how to install``manylinux2014`` wheels. However, source build will also fail because of too old``pip`` because it does not understand build dependencies in``pyproject.toml``. To use the new``manylinux2014`` pre-built wheels (or to build from source), your``pip`` version must be >= 19.3. Please upgrade``pip`` with``pip install --upgrade pip``.

**Q: Pip install fails with``Could not find a version that satisfies the requirement ...``?**