Build Failure on ports-10.7_x86_64: pandoc, stack

[buildbot at macports.org]

Status:       Failure
Build slave:  ports-10.7_x86_64
Full logs:    https://build.macports.org/builders/ports-10.7_x86_64-watcher/builds/3141
Build reason: The SingleBranchScheduler scheduler named 'ports' triggered this build
Port list:    pandoc
Subport list:
	- pandoc
Variants:     None
Revision:     e87d6d26a3570bab95932798cfcbf50ff6c79503
Build time:   0:03:29
Author:       Quentin Smith <quentin at mit.edu>

Log from failed builds:
	Building 'pandoc' ... [ERROR] (failed to install dependency 'stack')
	> maintainers: s.t.smith at ieee.org.

Broken ports:
	- pandoc
	- stack

Responsible maintainers:
	- s.t.smith at ieee.org

Links to individual build jobs:
- ports-10.7_x86_64-builder #13182
  https://build.macports.org/builders/ports-10.7_x86_64-builder/builds/13182

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