Here's the obvious but untested patch.
-- Autotools hint: to do a zx-spectrum build on a pdp11 host, type: ./configure --host=zx-spectrum --build=pdp11
--- clock-setup-0.131/finish-install.d/10clock-setup~ 2016-01-21 05:00:53.000000000 +0100 +++ clock-setup-0.131/finish-install.d/10clock-setup 2017-02-12 02:08:57.930763126 +0100 @@ -96,13 +96,17 @@ db_get clock-setup/utc if [ "$RET" = true ]; then - sed -i -e 's:^UTC="no":UTC="yes":' -e 's:^UTC=no:UTC=yes:' $utcfile + if [ -e $utcfile ]; then + sed -i -e 's:^UTC="no":UTC="yes":' -e 's:^UTC=no:UTC=yes:' $utcfile + fi if [ -e /target/etc/adjtime ]; then sed -i -e 's:^LOCAL$:UTC:' /target/etc/adjtime fi OPT="--utc" else - sed -i -e 's:^UTC="yes":UTC="no":' -e 's:^UTC=yes:UTC=no:' $utcfile + if [ -e $utcfile ]; then + sed -i -e 's:^UTC="yes":UTC="no":' -e 's:^UTC=yes:UTC=no:' $utcfile + fi if [ -e /target/etc/adjtime ]; then sed -i -e 's:^UTC$:LOCAL:' /target/etc/adjtime fi
