$this->bbcode_second_pass_code('', '% uname -a
Linux raspberrypi 3.6.11-2-ARCH+ #1 PREEMPT Mon Dec 31 23:00:25 UTC 2012 armv6l GNU/Linux
% clang
clang: error while loading shared libraries: libLLVM-3.2.so: cannot open shared object file: No such file or directory
% find / -name 'libLLVM-3.2.so'
/usr/lib/llvm/libLLVM-3.2.so
% LD_PRELOAD=/usr/lib/llvm/libLLVM-3.2.so clang
clang: error: no input files
')
There we go.
So one of these packages has a bug somewhere. Perhaps adding the directory to the LD path will fix it.