make get-sources: Wrong signature on xen-4.6.1.tar.gz.UNTRUSTED!

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Hi guys,

I am trying to rebuild Qubes packages for my ArchLinux template so I
can update to the new pulseaudio version, but in qubes-builder I cannot
get beyond make get-sources this time:

......

-> Updating sources for app-thunderbird...
--> Fetching from https://github.com/marmarek/qubes-app-thunderbird.git
master...
--> Verifying tags...
--> Merging...

-> Updating sources for app-linux-pdf-converter...
--> Fetching from
https://github.com/marmarek/qubes-app-linux-pdf-converter.git master...
--> Verifying tags...
--> Merging...

-> Updating sources for linux-template-builder...
--> Fetching from
https://github.com/marmarek/qubes-linux-template-builder.git master...
--> Verifying tags...
--> Merging...

--> Downloading additional sources for vmm-xen...
Wrong signature on xen-4.6.1.tar.gz.UNTRUSTED!
Makefile:77: recipe for target 'xen-4.6.1.tar.gz' failed
make[1]: *** [xen-4.6.1.tar.gz] Error 1
Makefile:188: recipe for target 'vmm-xen.get-sources-extra' failed
make: *** [vmm-xen.get-sources-extra] Error 2