If you are running after doing `cmsenv`, you should be able to simply use `ROOT.gSystem.Load("libHiggsAnalysisCombinedLimit")`, cf. usage in [`combine`](https://github.com/cms-analysis/HiggsAnalysis-CombinedLimit/search?q=libHiggsAnalysisCombinedLimit&ref=cmdform). Ditto other places.
Also `.so` could be removed from other library names: ROOT knows which (platform-dependent) suffix to use.