When you give a git repo for ExternalProject, it will *always* execute
the UPDATE_COMMAND by default. And then, all the steps after update
will re-execute since update re-ran.
If you want to use a git repo, but prevent this behavior, you can say:
UPDATE_COMMAND ""
to eliminate the default update step.
You can also snap to a known commit in the repo by using GIT_TAG.
HTH,
David C.
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