this change fixes the FTBFS on Debian hurd-* and kfreebsd-*.
* Update build-dependencies to permit tcl8.6. Closes:#818475.
* Replace ad-hocery with use of offsetof/typeof. Closes:#812718.
+ * Honour dpkg-architecture's DEB_HOST_GNU_TYPE, to fix cross-building.
-- Ian Jackson <ijackson@chiark.greenend.org.uk> Tue, 24 Jan 2017 13:14:06 +0000