title: -bash: opt: command not found in MAC OS X Yosemite
body: <p>I am trying to run a LLVM pass and have the following version of gcc:</p>
  
  <p>Configured with: </p>
  
  <pre><code>-- prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
  Apple LLVM version 6.1.0 (clang-602.0.53) (based on LLVM 3.6.0svn)
  Target: x86_64-apple-darwin14.5.0
  Thread model: posix
  </code></pre>
  
  <p>I downloaded the LLVM 3.2 source from the official site and have that unzipped in my project folder.</p>
  
  <p>From the project folder I am trying to run the following command:</p>
  
  <pre><code>opt -load /Users/jigs/Downloads/CS_298/llvm-3.1.src/lib/Transforms/LLVMHello.dylib -hello -S morph_1.s mul -o=morph_output.s
  </code></pre>
  
  <p>I get an error saying opt does not exist. I am pretty sure opt is a part of LLVM source but it does not work.</p>