Build Failure on ports-10.6_x86_64: swi-prolog-devel

[buildbot at macports.org]

Status:       Failure
Build slave:  ports-10.6_x86_64
Full logs:    https://build.macports.org/builders/ports-10.6_x86_64-watcher/builds/4634
Build reason: The SingleBranchScheduler scheduler named 'ports' triggered this build
Port list:    swi-prolog-devel
Subport list:
	- swi-prolog-devel
Variants:     None
Revision:     723dc47758e5ea1c6a249ab6514badd704a31315
Build time:   0:11:14
Author:       Paulo Moura <pmoura at logtalk.org>

Log from failed builds:
	Building 'swi-prolog-devel' ... [ERROR]
	> maintainers: J.Wielemaker at uva.nl,pmoura at logtalk.org.

Broken ports:
	- swi-prolog-devel

Responsible maintainers:
	- J.Wielemaker at uva.nl
	- pmoura at logtalk.org

Links to individual build jobs:
- ports-10.6_x86_64-builder #20897
  https://build.macports.org/builders/ports-10.6_x86_64-builder/builds/20897

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MacPorts Buildbot
https://build.macports.org/