os_version == 10.15.5 # All nodes should be on 10.15.5
brew cmake >= 3.17.2 # All nodes have 3.17.2
brew ninja >= 1.8.2 # Stage2 verbose output
pip psutil >= 5.4.5 # Required for timeouts in the GTest Suite.
pip six >= 1.11.0 # Required for urllib
xcode == 11.5