Some more useful information: The following commands allow me to create the debian package.
cd tcsh-6.17.06 sed 's|\tdh_auto_configure|\tdh_auto_configure -- CFLAGS="$(shell dpkg-buildflags --get CFLAGS) -D_FILE_OFFSET_BITS=64 -L/lib/x86_64-linux-gnu"|' -i debian/rules dpkg-buildpackage -b -uc -- Laurent Dard -- To UNSUBSCRIBE, email to debian-bugs-rc-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org