title: Installation of OpenCL package in R
body: <p>I'm trying to install the <code>OpenCL</code> package from CRAN. To this end, I first installed Intel SDK for OpenCL applications which I now find in the folder <code>C:\Program Files(x86)\Intel\OpenCL SDK\6.3</code>. However, this still gets me into trouble because of what I believe to be a failure to find this newly-installed library:</p>
  
  <pre><code>*** arch - i386
  c:/Rtools/mingw_32/bin/gcc  -I"C:/PROGRA~1/R/R-33~1.3/include" -DNDEBUG     -I"d:/Compiler/gcc-4.9.3/local330/include"     -O3 -Wall  -std=gnu99 -mtune=core2 -c ocl.c -o ocl.o
  ocl.c:6:23: fatal error: CL/opencl.h: No such file or directory
   #include &lt;CL/opencl.h&gt;
                         ^
  compilation terminated.
  make: *** [ocl.o] Error 1
  Warning: running command 'make -f "Makevars" -f "C:/PROGRA~1/R/R-33~1.3/etc/i386/Makeconf" -f "C:/PROGRA~1/R/R-33~1.3/share/make/winshlib.mk" SHLIB="OpenCL.dll" OBJECTS="ocl.o tools.o"' had status 2
  ERROR: compilation failed for package 'OpenCL'
  * removing 'C:/Users/seban876/Documents/R/win-library/3.3/OpenCL'
  </code></pre>
  
  <p>How can I make sure this library is found when compiling the package from source? </p>