ITK imposes a limit on the source and build directory length
 for good reasons. This forces us to have ITK in a shorter path eg:
C:\Temp\ITK for MSVC compilers. The limit mentioned in ITK for
directory length is 50.
http://itk.org/gitweb?p=ITK.git;a=blob;f=CMakeLists.txt;h=9730213aee02b16891cee231a1cd4f990ab9bb9f;hb=HEAD#l26