title: ld: library not found for -lgfortran - Mac Symlink issue?
body: <p>I am trying to install ObsPy with pip.</p>
  
  <p>The installation fails on the cc command below:</p>
  
  <pre><code>cc -bundle -undefined dynamic_lookup -L/usr/local/lib -L/usr/local/opt/sqlite/lib build/temp.macosx-10.8-x86_64-2.7/obspy/taup/src/emdlv.o build/temp.macosx-10.8-x86_64-2.7/obspy/taup/src/libtau.o build/temp.macosx-10.8-x86_64-2.7/obspy/taup/src/ttimes_subrout.o -lgfortran -o build/lib.macosx-10.8-x86_64-2.7/obspy/lib/libtaup.so
  
  ld: library not found for -lgfortran
  </code></pre>
  
  <p>This SO question is similar: <a href="https://stackoverflow.com/questions/10881002/lgfortran-not-found">lgfortran not found</a>, but the solution there was to change the makefile. I don't know how to do that when unsing pip install. I have installed gfortran using homebrew. </p>
  
  <p>Is there a way that I can place a symlink to the existing gfortran lib folder in the location that this command is searching?</p>
  
  <p>Would that location be <code>/usr/local/lib</code>?</p>