Right; that’s what I built.  I had both libevent and hwloc installed in /usr.  
I configured with —with-hwloc=external.  It built against the external hwloc 
and the internal libevent.  So there must be some slight variation on the theme 
I’m missing.

Brian

> On Apr 5, 2017, at 11:36 AM, r...@open-mpi.org wrote:
> 
> Not quite the problem I mentioned. The problem arises if you want external 
> hwloc, but internal libevent - and both have external versions in (say) /usr. 
> If you point hwloc there, then the -I and -L flags will cause us to pull in 
> the /usr libevent versions instead of the internal ones - and havoc ensues.
> 
> 
>> On Apr 5, 2017, at 11:30 AM, Barrett, Brian via devel 
>> <devel@lists.open-mpi.org> wrote:
>> 
>> All -
>> 
>> On the telecon yesterday, there was discussion of external hwloc causing 
>> problems if libevent was also installed in the same location.  Does anyone 
>> have details on exactly what the failure mode is?  I tried what I think is 
>> the issue (./configure —with-hwloc=external with libevent installed in /usr/ 
>> as well) and everything built / works fine.  I checked the library paths and 
>> include and everything looks normal, so I must have the wrong scenario.  
>> Hints?
>> 
>> Thanks,
>> 
>> Brian
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