New VP1LightExternals project for VP1Light
This MR adds a new Externals project, VP1LightExternals
, which is needed by the Athena project VP1Light
.
It also adds a CMake cache variable to steer the build of some External packages --- other than the "obvious" ones: Qt, SoQt, and Coin3D --- relevant to VP1Light (e.g., ROOT).
Tested on SLC6, Ubuntu 16.0.4 and 18.0.4, macOS 10.14 "Mojave".
This MR replaces !407 (closed).
Once again, thanks to @akraszna for the advice and all the invaluable suggestions while setting the new Externals project for VP1Light.
Edited by Riccardo Maria Bianchi