"sudo apt-get build-dep openafs" fails due to unmet dependencies

[Karl-Philipp Richter]

`sudo apt-get build-dep openafs` fails due to

    The following packages have unmet dependencies:
     doxygen : Depends: libclang1-3.6 (>= 3.2) but it is not going to be installed
    E: Build-dependencies for openafs could not be satisfied.

Manually installing `libclang1-3.6` fails with

    The following packages have unmet dependencies:
     libclang1-3.6 : Depends: libllvm3.6v5 but it is not going to be installed
    E: Unable to correct problems, you have held broken packages.

and `libllvm3.6v5` with

    The following packages have unmet dependencies:
     libkf5configgui5 : Depends: libqt5gui5 (>= 5.2.0) but it is not going to be installed or
                                 libqt5gui5-gles (>= 5.2.0) but it is not going to be installed
     libkf5waylandclient5 : Depends: libqt5gui5 (>= 5.0.2) but it is not going to be installed or
                                     libqt5gui5-gles (>= 5.0.2) but it is not going to be installed
     liboxideqtcore0 : Depends: libqt5gui5 (>= 5.4.0) but it is not going to be installed or
                                libqt5gui5-gles (>= 5.4.0) but it is not going to be installed
     liboxideqtquick0 : Depends: libqt5gui5 (>= 5.0.2) but it is not going to be installed or
                                 libqt5gui5-gles (>= 5.0.2) but it is not going to be installed
     libqmenumodel0 : Depends: libqt5gui5 (>= 5.0.2) but it is not going to be installed or
                               libqt5gui5-gles (>= 5.0.2) but it is not going to be installed
     libqt5multimedia5 : Depends: libqt5gui5 (>= 5.2.0) but it is not going to be installed or
                                  libqt5gui5-gles (>= 5.2.0) but it is not going to be installed
     libqt5quick5-gles : Depends: libqt5gui5 (>= 5.4.1) but it is not going to be installed or
                                  libqt5gui5-gles (>= 5.4.1) but it is not going to be installed
     libqt5waylandclient5 : Depends: libqt5gui5 (>= 5.4.1) but it is not going to be installed or
                                     libqt5gui5-gles (>= 5.4.1) but it is not going to be installed
     oneconf : Depends: ubuntu-sso-client but it is not going to be installed
               Recommends: software-center (>= 4.1.21) but it is not going to be installed
               Recommends: update-notifier (>= 0.103)
     qml-module-qtquick-layouts : Depends: libqt5gui5 (>= 5.3.0) but it is not going to be installed or
                                           libqt5gui5-gles (>= 5.3.0) but it is not going to be installed
     qtubuntu-sensors : Depends: libqt5gui5 (>= 5.2.0) but it is not going to be installed or
                                 libqt5gui5-gles (>= 5.2.0) but it is not going to be installed
    E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.

`sudo dpkg --configure -a` and `sudo apt-get update && sudo apt-get -f install` doesn't help.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: openafs-fileserver (not installed)
Uname: Linux 4.2.5-040205-generic x86_64
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
Date: Sun Dec 6 08:18:54 2015
InstallationDate: Installed on 2015-04-20 (229 days ago)
InstallationMedia: Ubuntu-Server 14.10 "Utopic Unicorn" - Release amd64 (20141022.2)
ProcEnviron:
 TERM=screen
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: openafs
UpgradeStatus: Upgraded to wily on 2015-10-26 (40 days ago)