[gradsusr] How to install grads on Mac OS X 10.8.4 ?

[Qian, JianHua]

Hi,

My student got a brand new Mac OS X 10.8.4.   We cannot install grads on the Mac.
We put all the file in /usr/local/bin and /usr/local/lib as instructed in the INSTALL.
Following is the error message when we do grads:

dyld: Library not loaded: /opt/local/lib/libX11.6.dylib
  Referenced from: /usr/local/bin/grads
  Reason: image not found
Trace/BPT trap: 5

Thanks!
Joshua
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