Library not loaded?

I am trying to install a scientific program onto my mac and when i try and execute it this error comes up and i cant find any literature on the net to fix it...

dyld: Library not loaded: /usr/local/lib/libgfortran.2.dylib
Referenced from: /Users/Olson/Documents/Research/Modelfree/modelfree4_mac/Intel/modelfree4
Reason: image not found
Trace/BPT trap

Anyone know what hat means. Thanks in advance.

Does the shared library "/usr/local/lib/libgfortran.2.dylib" exist?

No but when i try and make it, it says that permission is denied....any suggestions

What do you mean by "make it"?

Normally it is "root" who installs binaries in /usr/local/lib or /usr/lib.

I guess i dont know how to do that from a mac. I thought when i was logged into my user that is the root. Any help would be appreciated for this newb. Thanks