ROOT Build Fixes, 1.0 branch (2018.10.23.)
ROOT's internal build of Davix and VDT is unfortunately not set up all correctly in 6.14/04. When building AnalysisBaseExternals on a very bare-bones VM, this prevents the build from succeeding.
See https://sft.its.cern.ch/jira/browse/ROOT-9739 and https://github.com/root-project/root/pull/2829 for further details on this issue. For now I decided to work around the problem by patching ROOT as part of atlasexternals...