Build Failure on ports-10.12_x86_64: libsl

[buildbot at macports.org]

Status:       Failure
Build slave:  ports-10.12_x86_64
Full logs:    https://build.macports.org/builders/ports-10.12_x86_64-watcher/builds/39066
Build reason: A build was forced by 'jmr <jmr at localhost>': force build
Port list:    libunwind libsl libuv
Subport list:
	- libsl
Variants:     None
Revision:     
Build time:   0:01:41
Author:       

Log from failed builds:
	Building 'libsl' ... [ERROR]
	> maintainers: .

Broken ports:
	- libsl

Links to individual build jobs:
- ports-10.12_x86_64-builder #131876
  https://build.macports.org/builders/ports-10.12_x86_64-builder/builds/131876

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