Can't compile sample mic code

Recently downloaded an evaluation copy of parallel studio xe 2015. I have a server running Redhat Linux 6.6 with 2 MIC cards and have (successfully, I think, install mpss 3.4.1.

I am trying to compile sample code in <install dir>/composerxe/Samples/en_US/C++/mic_samples/intro_sampleC with `make mic' and get the error:

sampleC00.c(29): catastrophic error: cannot open source file "offload.h"
  #include <offload.h>

Pretty clear I've munged the install. Any suggestions as to problem would be greatly appreciated. Note that I have sourced the `compilervars.csh' file and it appears to have successfully set my path...

Thanks,

Tom