I got the same error above when I downloaded zint-2.4.2 from https://zint.github.io/ and tried to compile it on Ubuntu 18.04. I then downloaded zint-2.7.0.tar.gz from here (Sourceforge) and it compiled cleanly
I have installed COM0COM on Microsoft Windows [Version 10.0.18362.418] running in VMWare Fusion Just a note to say that I had some other port monitor software installed and I was seeing SYSINFO when connecting to the higher port that was connected to COM3 After uninstalling CipherLabs software which is for scanning guns and uses a USB to VCOM software the above problem went away and the COM0COM worked as expected