[MacPorts] #16664: swi-prolog hardcodes /usr/X11R6

[MacPorts]

#16664: swi-prolog hardcodes /usr/X11R6
-------------------------------------+--------------------------------------
 Reporter:  ryandesign at macports.org  |       Owner:  pmoura at logtalk.org
     Type:  defect                   |      Status:  new               
 Priority:  Normal                   |   Milestone:  Port Bugs         
Component:  ports                    |     Version:  1.6.0             
 Keywords:                           |        Port:  swi-prolog        
-------------------------------------+--------------------------------------
 swi-prolog uses "/usr/X11R6" in the configure.env and build.env, but X11
 might be in a different place. The port should use the ${x11prefix}
 variable instead.

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Ticket URL: <http://trac.macports.org/ticket/16664>
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