Re: Required architecture 'x86_64' for GSL

[Mark Galassi]

> [...] added the flags to ‘Other linker flags’ in Xcode [...]
> (see screenshot attached)

You are unlikely to get useful help this way, unless someone else has had 
exactly your problem.

I recommend that you do your compile and link from the command line so you can 
see what's really happening, and once you have it working there you then try it 
in a graphical integrated development environment.

If you do a linux build I can definitely help you, since that's the platform I 
use (call me and we can share a screen to debug).  If you do a command line 
build on a non-linux then I can try to help you, but it is less likely.