xorg-libXt must be installed with +flat_namespace.

[Maria Vecherkovskaya]

$ port rdependents openmotif

I had the same error during last upgrade.
I used 
$ port install xorg-libXt +flat_namespace

wich made macports install this variant, but it led to linking errors, so macports automatically activated the universal variant of the port.
I than manually activated the +flat_namespace variant which allowed me to install openmotif. When the upgrade completed, macports reversed to  the universal variant. To use port that depends on openmotif I had to manually activate +flat_namespace variant. Looks like this may happen with all the ports that require openmotif. Everything else works fine. But you may find that you have to switch back and forth between the universal and +flat_namespace variants
-- 
Maria Vecherkovskaya
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On June 18, 2016 at 15:45:31, Hinckley Dan (dbh at suiattle.org) wrote:

I’m getting the error referred to in the Trac system:

Error: org.macports.archivefetch for port openmotif returned: xorg-libXt must be installed with +flat_namespace.
The trac ticket offers a solution but I can’t work out is whether installing xorg-libXt with that option will have consequences for other ports.

How do I find out which port(s) has/have openmotif as a dependency?
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