UPDATE:

After some google searching, I discovered that my version of gcc was too new for the version of matlab that I am using (2012a). [Edit: I realize my earlier post said matlab 2007, I switched to our newer version of matlab hoping it would solve the problem, but I get the same error.] I downloaded gcc-4.4 which is compatible with 2012a and followed the steps suggested here (http://huhmaster.blogspot.com/2012/06/co...).
I was able to successfully compile a tester file through matlab, however I am getting the same error when running installW2MHS.m.
Still hoping for some suggestions, thank you for your time!