[MacPorts] #20876: docs variant for libspectre

[MacPorts]

#20876: docs variant for libspectre
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 Reporter:  illogic-al@…             |       Owner:  devans                         
     Type:  request                  |      Status:  new                            
 Priority:  Normal                   |   Milestone:                                 
Component:  ports                    |     Version:  1.7.1                          
 Keywords:  doxygen x11 no_x11       |        Port:  libspectre doxygen kdegraphics4
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 In order to use libspectre for okular (a part of kdegraphics4) I'd like to
 add a "docs" variants so that doxygen (and primarily it's unnecessary X11
 deps) doesn't get pulled in to a KDE build by default, since it's aqua
 only.

 I can add and commit but wanted the maintainer's (or anyone's really)
 blessing first.

 BTW I've had this port in my personal repo for months and totally forgot
 about it. Only noticed after remembered after seeing this on svn up

 '''
 svn: Failed to add directory 'print/libspectre': an unversioned directory
 of the same name already exists
 '''
 Thanks for finally adding it :-)

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Ticket URL: <http://trac.macports.org/ticket/20876>
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