It could be that a fairly recent change was made to fix that conflict. I 
believe Jeff and Gilles modified the internal hwloc header name(s) to ensure we 
got the right one of those. However, that didn’t get done for libevent and/or 
pmix, so the conflict likely still resides there.

> On Apr 5, 2017, at 11:56 AM, Barrett, Brian via devel

> <devel@lists.open-mpi.org> wrote:
> 
> 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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>>> devel@lists.open-mpi.org
>>> https://rfd.newmexicoconsortium.org/mailman/listinfo/devel
>> 
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