I don't know if there is a fancy way (I have never used gitk) to do this but I find the commit that change /resiprocate/reTurn repo and I commented all the
#ifdef USE_SSL
#endif
(just the ifdef not what was inside of it) added in that commit and it is compiling now. I think the flag USE_SSL is not being set as it supposed to be.
I will check again later (I'm going to a class now) if I could find the problem with the USE_SSL.
By the way, I don't know what information I should give you to identify that commit so I will put here what I see in the gitk window: