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

[MacPorts]

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

 Replying to [comment:1 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
 > }}}

 Maybe dependency on `autoconf_archive` is needed but not declared? And I
 have it installed.

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Ticket URL: <https://trac.macports.org/ticket/69964#comment:2>
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