Is libLLVM-3.4.so: part of src or not?

When starting Xorg, AIGLX gets disabled and RadeonKMS complains:

(EE) AIGLX error: dlopen of /usr/local/lib/dri/r600_dri.so failed 
(Shared object "libLLVM-3.4.so" n
ot found, required by "r600_dri.so")
(EE) AIGLX: reverting to software rendering
(II) AIGLX: Screen 0 is not DRI capable
(EE) AIGLX error: dlopen of /usr/local/lib/dri/swrast_dri.so failed 
(Shared object "libLLVM-3.4.so"
  not found, required by "swrast_dri.so")
(EE) GLX: could not load software renderer
(II) GLX: no usable GL providers found for screen 0

A search on the system shows libLLVM-3.4.so only exists under 
/usr/local/lib32.
I built and installed devel/llvm34, re-started Xorg and the log shows 
AIGLX as starting normally (no error).