Wrong y for a top-level window - in cocoa it's different, it not top-left, but bottom-left corner.
Fixed a a number of CMake issues. Adapted to new rescission of llvm/cling
Added option 'all' to switch on all optional components.
upgrade to Pythia8 >= 8180. Previous versions don't compile with latest clang.
show full compiler invocation (easier to later copy/paste in case of problems).
fix for ROOT-5573
Try to fix compiling warning on Vc on old gcc versions (less than 4.5)