If you’re trying to install from source, you’ll need to follow our instructions. What’s missing here is a C++ compiler, which should have been installed as a part of step 4 in these instruction – i.e. the command:
pacman -S git python pkg-config mingw-w64-x86_64-gcc mingw-w64-x86_64-eigen3 mingw-w64-x86_64-qt5 mingw-w64-x86_64-fftw mingw-w64-x86_64-libtiff mingw-w64-x86_64-libpng
Make sure this command runs to completion to install all the dependencies, and that should fix the issue.
All the best,
thank you, I’ll try it again