Build Failure on ports-10.11_x86_64: virtualbox, virtualbox-extension-pack, virtualbox-guest-additions

[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/21351
Build reason: The SingleBranchScheduler scheduler named 'ports' triggered this build
Port list:    krdc LibVNCServer virtualbox
Subport list:
	- LibVNCServer
	- krdc
	- virtualbox
	- virtualbox-extension-pack
	- virtualbox-guest-additions
Variants:     None
Revision:     5548c52a60d75028bffa5c96b3ac2779da78a122
Build time:   0:45:20
Author:       Ryan Schmidt <ryandesign at macports.org>

Log from failed builds:
	Building 'virtualbox' ... [ERROR]
	> maintainers: .
	Building 'virtualbox-extension-pack' ... [ERROR] (failed to install dependency 'virtualbox')
	> maintainers: .
	Building 'virtualbox-guest-additions' ... [ERROR] (failed to install dependency 'virtualbox')
	> maintainers: .

Broken ports:
	- virtualbox
	- virtualbox-extension-pack
	- virtualbox-guest-additions

Links to individual build jobs:
- ports-10.11_x86_64-builder #77170
  https://build.macports.org/builders/ports-10.11_x86_64-builder/builds/77170
- ports-10.11_x86_64-builder #77171
  https://build.macports.org/builders/ports-10.11_x86_64-builder/builds/77171
- ports-10.11_x86_64-builder #77172
  https://build.macports.org/builders/ports-10.11_x86_64-builder/builds/77172
- ports-10.11_x86_64-builder #77173
  https://build.macports.org/builders/ports-10.11_x86_64-builder/builds/77173
- ports-10.11_x86_64-builder #77174
  https://build.macports.org/builders/ports-10.11_x86_64-builder/builds/77174

-- 
Best regards,
MacPorts Buildbot
https://build.macports.org/