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/36081
Build reason: The SingleBranchScheduler scheduler named 'ports' triggered this build
Port list:    vtk
Subport list:
	- vtk
Variants:     None
Revision:     9a41fd111fd56901d1af384e5a9e8a3631752286
Build time:   1:05:22
Author:       Ruben Di Battista <rubendibattista at users.noreply.github.com>

Log from failed builds:

Links to individual build jobs:
- ports-10.11_x86_64-builder #118137
  https://build.macports.org/builders/ports-10.11_x86_64-builder/builds/118137

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