title: Unresolved external symbol
body: <p>Help me guys,
  I've been searching for a really long time.</p>
  
  <p>I'm using visual studio 2010 and I tried to include an external lib but I get an unresolved external error.</p>
  
  <p>The external project is composed of files in the following way</p>
  
  <pre><code>backend.cpp
  //some functions 
  frontend.cpp
  //some functions
  header.h
  </code></pre>
  
  <p>I build this project using SCons then I includes the .lib file in the project and refered to its path and I copied the .h file to msvc directory .</p>
  
  <p>VS seems to access and read the functions in backend.cpp(from the auto complete) but when I run the project it says that there is an unresolved external @ the called function</p>