title: devtools path length
body: <p>I'm trying to install ITKR (<a href="https://github.com/stnava/ITKR" rel="nofollow noreferrer">https://github.com/stnava/ITKR</a>) libs in my R development environment in Windows 10 but I'm running into the following problem when I run <code>devtools::install_github( "stnava/ITKR" )</code></p>
  
  <pre><code>:: CMake Error at CMakeLists.txt:41 (message):
    ITK source code directory path length is too long (67 &gt; 50).Please move the
    ITK source code directory to a directory with a shorter path.
  -- Configuring incomplete, errors occurred!
  See also "C:/tmp/RtmpiiQL5o/devtools37c84d7a5f42/stnava-ITKR-805a390/src/itkb/CMakeFiles/CMakeOutput.log"
  </code></pre>
  
  <p>Now I already changed tempdir to 'c:\tmp' and my working directory as well so I cannot possibly trim it further.
  Any clue on what I can do to fix this? Thank you!</p>