Error on macOS: mexmaci64 file cannot be opened because the developer cannot be verified

Discussions
,
2

This was documented before:

https://en.wikibooks.org/wiki/SPM/Installation_on_64bit_Mac_OS_(Intel)#macOS_Big_Sur

I had a section about it on the Installation page, but only for starting the compiled version of Brainstorm.
I will had the links to the SPM and FieldTrip bug pages somewhere else.