The LORENE ExternalLibraries (both versions) contain some code to propagate OpenMP to the ExternalLibrary from Cactus. However Cactus since 2013 does this on its own.

Pull requests are here:

https://bitbucket.org/einsteintoolkit/lorene/pull-requests/1/lorene2-remove-manual-handling-of-openmp/diff

https://github.com/EinsteinToolkit/ExternalLibraries-LORENE/pull/1

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2311/remove-no-longer-needed-openmp-kludges