Hi, I also have an issue with the DLL, on windows 10, tried with both python 3.5.6 and 3.6.3 (our default version). My steps with a clean conda environment: conda create -n py35 python=3.5 numpy conda config --append channels conda-forge conda install -c repa slycot conda install ...
As discussed in python-control/Slycot#98 (comment) I am not very familiar with the conda-forge and smithy workflow, but let's try: Checklist Used a fork of the feedstock to propose changes Bumped the build number (if the version is unchanged) @conda-forge-admin, please rerender Ensured ...