[MacPorts] #31001: swi-prolog, swi-prolog-devel, swi-prolog-lite: remove expat dependency on darwin 9

[MacPorts]

#31001: swi-prolog, swi-prolog-devel, swi-prolog-lite: remove expat dependency on
darwin 9
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 Reporter:  ryandesign@…             |       Owner:  J.Wielemaker@…                               
     Type:  enhancement              |      Status:  new                                          
 Priority:  Normal                   |   Milestone:                                               
Component:  ports                    |     Version:  2.0.1                                        
 Keywords:  haspatch                 |        Port:  swi-prolog, swi-prolog-devel, swi-prolog-lite
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 In r31733 for #13461 a dependency on expat was added to swi-prolog for
 darwin 9 only. The title of the ticket says this was done "to fix build on
 Mac OS X 10.5 Leopard". The same was done for swi-prolog-devel in r42976
 for #16964, and for swi-prolog-lite in r63856 for #23155.

 I don't understand why it would need expat only on darwin 9, but not on
 darwin 8, darwin 10 or darwin 11. I just now installed the current version
 of swi-prolog on Leopard. The machine did have expat installed, but
 looking through the log, I see no mention of expat or xmlwf being used,
 and the installed files don't appear to be linked to libexpat. I also
 grepped the swi-prolog source and find no occurrences of "xmlwf". There
 are a few occurrences of "expat" but they either merely refer to the expat
 license, or are Mac OS X / MacPorts-specific documentation stating that
 expat is a dependency, without elaborating why.

 Can this dependency be removed or is there some hidden use of expat
 exclusively on darwin 9 that I'm not seeing?

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Ticket URL: <https://trac.macports.org/ticket/31001>
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