More safety checks in the super build driver script #1
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Allow overriding the root_dir setting with an environment variable.
But provide a reasonable/existing default value if it's not
overridden.
Check for existence of key elements, and warn if they are not there.
(cmake, git, source dir...)
Add a wrapper script to make it easy to "double-click and observe"
without the window disappearing when the script is done.