Build Failure on ports-10.7_x86_64: ghc, 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/691
Build reason: The SingleBranchScheduler scheduler named 'ports' triggered this build
Port list:    ghc
Subport list:
	- ghc
Variants:     None
Revision:     b579fa962421adca1e13f7e317582daab4e9f419
Build time:   0:03:57
Author:       Steven Thomas Smith <s.t.smith at ieee.org>

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

Broken ports:
	- ghc
	- stack

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

Links to individual build jobs:
- ports-10.7_x86_64-builder #4914
  https://build.macports.org/builders/ports-10.7_x86_64-builder/builds/4914

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