failed powerpc build of pygobject 3.21.0-1

[Debian buildds]

 * Source package: pygobject
 * Version: 3.21.0-1
 * Architecture: powerpc
 * State: failed
 * Suite: experimental
 * Builder: porpora.debian.org
 * Build log: https://buildd.debian.org/status/fetch.php?pkg=pygobject&arch=powerpc&ver=3.21.0-1&stamp=1471961675&file=log

Please note that these notifications do not necessarily mean bug reports
in your package but could also be caused by other packages, temporary
uninstallabilities and arch-specific breakages.  A look at the build log
despite this disclaimer would be appreciated however.