[MacPorts] #69964: gconfmm fails to build: error: template with C linkage

[MacPorts]

#69964: gconfmm fails to build: error: template with C linkage
---------------------------+--------------------
  Reporter:  barracuda156  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.9.3
Resolution:                |   Keywords:
      Port:  gconfmm       |
---------------------------+--------------------

Comment (by ryandesign):

 How did you even get this far? On buildbot workers it fails before
 configure with:
 {{{
 Makefile.am:26: error: ENABLE_DOCUMENTATION does not appear in
 AM_CONDITIONAL
 }}}

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Ticket URL: <https://trac.macports.org/ticket/69964#comment:1>
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