Does not compile

As a follow-up to ug/ug!3 (closed): I checked this module out and tried to compile it with Clang 3.8. I don't get the warnings about the missing includes, I'll check with this module on my home computer. The error remains.

[ 29%] Building CXX object low/CMakeFiles/low.dir/fileopen.cc.o
/temp/gruenich/dune/complete/dune-uggrid/low/fileopen.cc:757:73: error: use of undeclared identifier 'ARCHNAME'
  printf("fileopen.c: DirWalk() not implemented for architecture: %s\n",ARCHNAME);
                                                                        ^
1 error generated.
low/CMakeFiles/low.dir/build.make:206: recipe for target 'low/CMakeFiles/low.dir/fileopen.cc.o' failed
gmake[2]: *** [low/CMakeFiles/low.dir/fileopen.cc.o] Error 1
CMakeFiles/Makefile2:2643: recipe for target 'low/CMakeFiles/low.dir/all' failed
gmake[1]: *** [low/CMakeFiles/low.dir/all] Error 2
Makefile:160: recipe for target 'all' failed
gmake: *** [all] Error 2
--- Failed to build dune-uggrid ---