title: Recompile with -fPIC option, but the option is already in the makefile
body: <p>I get this error when I do the make:</p>
  
  <pre><code>relocation R_X86_64_32 against `vtable for Torch::MemoryDataSet' can not be used 
  when making a shared object; recompile with -fPIC
  </code></pre>
  
  <p>It says that I should recompile with the <code>-fPIC</code> option. I did that, adding 
  the <code>-fPIC</code> option to <code>CFLAGS</code> and <code>CXXFLAGS</code>, but I still get the same error. Is there any way to solve this? I have seen that this problem is related with the use of a 64-bit machine, and it is true that I am using one.</p>