A python3.4 bugfix update has been released for Debian GNU/Linux 8 Extended LTS to fix the build on armh.
ELA-793-1 python3.4 bugfix update
Package : python3.4
ELA-793-1 python3.4 bugfix update
Version : 3.4.2-1+deb8u13 (jessie)
This update fixes the build on armhf, which was preventing security
updates from reaching that architecture.