FYI, following hko's approach ( thankyou ! ), and some excellent build documentation ( quite a rarity, thankyou
), I've also managed to now get an apparently working ( at least so far... ) build of .19 for Ubuntu 20.04. There appears to be an issue with some missing VTL related files, but this did not prevent the build - not sure what the root cause is, it may simply be a problem with the VTL cmakes. There is already a launchpad bug raised for this. I didn't analyse all the warnings kicked out by the build, most looked benign, though there were some 'potential use before initialised' ones that might be worth looking at.