As a workaround, compiling and manually installing
https://www.enigmail.net/download/source/enigmail-1.9.7.tar.gz seems to
work (Enigmail is active again).
Personally, I did not encounter any problem with the Debian version of
enigmail preceding this update, so I suggest keeping it to that version
for powerpc, if there are no other security implications (did not have
the time to sort them out, but basically messages sent encrypted were
sent encrypted, never in clear).
Stiepan A. Kovac
M Sc ICT Security
IT+Tech. Tel. Eng.
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