failed amd64 build of gnome-shell 2.29.0-2+b1

[Debian buildds]

 * Source package: gnome-shell
 * Version: 2.29.0-2+b1
 * Architecture: amd64
 * State: failed
 * Suite: unstable
 * Builder: brahms.debian.org
 * Build log: https://buildd.debian.org/fetch.cgi?pkg=gnome-shell&arch=amd64&ver=2.29.0-2%2Bb1&stamp=1271187003&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.