LLVM: CommandLine Error: Option 'enable-value-profiling' registered more than once!

With devel/llvm40 and lang/clang40 installed on recent CURRENT (as well as 11-STABLE),
graphics/blender (with option for OpenCL) and software compiled with lang/pocl fail/crash
with something similar like

[...]
: CommandLine Error: Option 'enable-value-profiling' registered more than once!
LLVM ERROR: inconsistency in registered CommandLine options
[...]

In all cases, beignet and mesa-lib has been installed in parallel to pocl or pocl in
parallel to the ports needed by blender, so I think this bug report on the LLVM list
reflects the problem:

 http://lists.llvm.org/pipermail/llvm-bugs/2016-October/051237.html

I have no clue how to workaround this. graphics/blender doesn't work anymore and any POCL
software (for OpenCL code on FreeBSD utilising CPUs) doesn't work either.

Is there a solution present?
-- 
O. Hartmann

Ich widerspreche der Nutzung oder Übermittlung meiner Daten für
Werbezwecke oder für die Markt- oder Meinungsforschung (§ 28 Abs. 4 BDSG).