We have trouble in building a wheel for python psutil 5.7.0. See at https://travis-ci.org/github/smarthomeNG/smarthome/jobs/688112865
It seems as if a newer version of gcc will cure this. Currently Travis is using gcc (Ubuntu 9.2.1-28ubuntu1) 9.2.1 20200203
but a normal desktop or server installation is using gcc version 9.3.0 (Ubuntu 9.3.0-10ubuntu2)
The problem seems to be here as well: steinbergmedia/vst3sdk#55