Thanks for this suggestion Patrick. This also worked for me on MacOS 10.14.2 and Postbox 7.0.60. I might suggest putting this more prominently in the wizard for Enigmail installation or in the instructions for dealing with Postbox. I hope GnuPG fixes this soon.
Version 1.0 released
noncentral F CDF does not work properly
Thanks. This error is now fixed with the changes from Dr. Pierre Gruet which have been incorporated into the git repository. New release soon.