Build Failure on ports-10.11_x86_64

[buildbot at macports.org]

Status:       Failure
Build slave:  ports-10.11_x86_64
Full logs:    https://build.macports.org/builders/ports-10.11_x86_64-watcher/builds/26868
Build reason: The SingleBranchScheduler scheduler named 'ports' triggered this build
Port list:    swi-prolog-devel
Subport list:
	- swi-prolog-devel
Variants:     None
Revision:     8754e6348d33a0eae2977174f2548e508562985e
Build time:   0:13:04
Author:       Paulo Moura <pmoura at logtalk.org>

Log from failed builds:

Links to individual build jobs:
- ports-10.11_x86_64-builder #92261
  https://build.macports.org/builders/ports-10.11_x86_64-builder/builds/92261

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