[MacPorts] #21579: libxml2 upgrade 2.7.3->2.7.4 breaks inkscape

[MacPorts]

#21579: libxml2 upgrade 2.7.3->2.7.4 breaks inkscape
------------------------------------------------+---------------------------
 Reporter:  michael.klein@…                     |       Owner:  macports-tickets@…                   
     Type:  defect                              |      Status:  new                                  
 Priority:  Normal                              |   Milestone:                                       
Component:  ports                               |     Version:  1.8.0                                
 Keywords:                                      |        Port:  libxml2                              
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 After upgrading to the latest libxml2, inkscape refuses to start:

 {{{
 $ inkscape
 Xlib:  extension "RANDR" missing on display "/tmp/launch-2Z2c89/:0".
 /Users/michael/.inkscape/preferences.xml:1: parser error : XML declaration
 allowed only at the start of the document
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
      ^
 /opt/local/share/inkscape/extensions/render_barcode.inx:1: parser error :
 XML declaration allowed only at the start of the document
 <?xml version="1.0"?>
      ^

 ** (inkscape:54136): CRITICAL **: Inkscape::Extension::Extension*
 Inkscape::Extension::build_from_reprdoc(Inkscape::XML::Document*,
 Inkscape::Extension::Implementation::Implementation*): assertion `doc !=
 NULL' failed
 }}}

 This looks much like https://bugzilla.gnome.org/show_bug.cgi?id=595128

 A fix for this regression can be found here:
 http://git.gnome.org/cgit/libxml2/commit/?id=9d3d141c412baa5c713ad3df48f1a4d179e

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Ticket URL: <http://trac.macports.org/ticket/21579>
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