SImfactory’s code to run testsuites extracts the “make” mdb entry to use it to run the test suites. However it does not do the substitution for @MAKEJOBS@ in it so the shell aborts. A fix is to either make simfactory offer a (fully expanded) @MAKE@ as a substitution during --testsuite or modify RunTestSuite to manually do the @MAKEJOBS@substitution.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2283/simfactorys-jobs-option-break-testsuite