[MacPorts] #27095: Upgrade Swi-Prolog 5.10.2_0 failed

[MacPorts]

#27095: Upgrade Swi-Prolog 5.10.2_0 failed
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 Reporter:  jean-philippe.humbert@…       |       Owner:  J.Wielemaker@…     
     Type:  defect                        |      Status:  new                
 Priority:  Normal                        |   Milestone:                     
Component:  ports                         |     Version:  1.9.1              
 Keywords:                                |        Port:  swi-prolog         
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Comment(by jean-philippe.humbert@…):

 Replying to [comment:3 pmoura@…]:
 > Moreover, there is no mention of a "xorg-libs" port in the "swi-prolog"
 portfile for SWI-Prolog 5.10.2. Maybe you need to run portindex?

 sorry what is portindex? In the documentation I understood, that it is
 needed, after a portfile is created....
 After I runned it, I saw two files portindex and  portindex.quick. they
 are both empty....
 Can you help or maybe point me to the right part of the documentation?

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Ticket URL: <https://trac.macports.org/ticket/27095#comment:5>
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