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Virtual environments

Use a conda environment pinned to the tested toolchain so builds are reproducible across machines.

Create an environment with the exact build dependencies, activate it, and install QXel into it:

bash
conda create -n qxel python=3.13.11 cmake=4.1.2 ninja=1.13.1 \
  pybind11=2.13.6 mkl=2025.0.0 mkl-include=2025.0.0
conda activate qxel
pip install .
Note Pinning CMake, Ninja, and MKL avoids most build issues. You can relax the pins once you have a working build.
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