How to get gdb to work using macports under OSX 10.11 El Capitan?

Question

This arose from How to install gdb (debugger) in Mac OSX El Capitan?.

I have macports working under el capitan no problem and have installed the gdb port but I can\

Answer 1

I just settled this problem by using the following command.

sudo dseditgroup -o edit -a yourusername -t user procmod

Which adds you to group procmod.

It's just because only users in procmod can use function task_for_pid, and you can find that the own group of /opt/local/bin/ggdb is procmod.