[MacPorts] #39908: Incompatible library version: libfontconfig.1.dylib requires version 8.0.0 or later, but libexpat.1.dylib provides version 7.0.0

[MacPorts]

#39908: Incompatible library version: libfontconfig.1.dylib requires version 8.0.0
or later, but libexpat.1.dylib provides version 7.0.0
------------------------------------+--------------------------
  Reporter:  Patrick.M.Roanhouse@…  |      Owner:  ryandesign@…
      Type:  defect                 |     Status:  new
  Priority:  Normal                 |  Milestone:
 Component:  ports                  |    Version:  2.2.0
Resolution:                         |   Keywords:
      Port:                         |
------------------------------------+--------------------------

Comment (by ryandesign@…):

 Ok, that's clear enough. Your MacPorts expat library version is 7. It
 should be 8. expat needs to be reinstalled.

 But this should never have happened in normal use, so who knows if expat
 is the only affected port. The only way I can think of for this to have
 happened is if you installed some third-party software which was itself
 packaged using libraries installed by MacPorts, and it overwrote your
 newer MacPorts libraries. See ProblemHotlist#xmlwf for more on this type
 of problem, some common culprits, and how to address it.

-- 
Ticket URL: <https://trac.macports.org/ticket/39908#comment:8>
MacPorts <http://www.macports.org/>
Ports system for OS X