Description

The QML library cannot be installed in an environment where NumPy is not already installed, for example a fresh virtual environment when installing another project which uses QML as a dependency.

To reproduce

python3 -m venv venv
source venv/bin/activate
pip install qml

If NumPy is installed beforehand, then it works

python3 -m venv venv
source venv/bin/activate
pip install numpy
pip install qml

How to fix

NumPy should be specified as a dependency in the setup configuration.