Xtensor is needed to compile the Neureka model.
It can be installed on Ubuntu with:
sudo apt install libxtensor-dev libxsimd-dev
It can be installed on Fedora with:
sudo dnf install xtensor-devel.x86_64
It can also be downloaded and installed to a custom location. In this case, the path must be given with this envvar:
export XTENSOR_INCLUDE_DIR=<path>