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Thank you for reporting how you fixed the problem. So "Command Line Tools for XCode 12", which you installed first, isn't the same as "Xcode 12.1", which fixed the problem? Sorry for the delayed reply, glad to see that this conversation was useful. That's right -Command Line Too...

Problem solved. Running mknrndll called the libreadline function from the Xcode.app directory in applications. That folder doesn't exist without downloading Xcode, which I did from the app store. After downloading XCode (12.1), I compiled the mod directory again and it was successful.

Hi. I just downloaded NEURON on Mac Catalina (10.15.7) and am trying to compile mod files from modeldb. I have tried two ways, dragging a mod folder (with a list of .mod files in it) to the mknrndll application. I have also tried navigating to the mod folder in a terminal and running mknrndll direct...