Build Failure on ports-10.8_x86_64_legacy

[buildbot at macports.org]

Status:       Failure
Build slave:  ports-10.8_x86_64_legacy
Full logs:    https://build.macports.org/builders/ports-10.8_x86_64_legacy-watcher/builds/25886
Build reason: The SingleBranchScheduler scheduler named 'ports' triggered this build
Port list:    swi-prolog-devel
Subport list:
	- swi-prolog-devel
Variants:     None
Revision:     d4b533481816db092179b1ba708b9d8f8bc68f53
Build time:   0:03:12
Author:       Paulo Moura <pmoura at logtalk.org>

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

Links to individual build jobs:
- ports-10.8_x86_64_legacy-builder #97967
  https://build.macports.org/builders/ports-10.8_x86_64_legacy-builder/builds/97967

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