I developed a build system for caravel: That's a build report it produced: https://pdk.libresilicon.com/caravel-build.html I am currently trying a newer version that should be in colours and better readable. You can see it on https://github.com/thesourcerer8/caravel-stdcelllib-stdcells/blob/release/openlane/build.pl

Lines reporting the numeric "CG Error" shouldn't be red

Yes, I was afraid I might overlook lines with error in them, I didnt expect CG Errors 🙂