termtypes.master glitch in building -current

When I've built -current on several machines recently, the procedure dies at ===> share/termtypes /usr/bin/tic -C -x /usr/src/share/termtypes/termtypes.master > termcap /usr/bin/tic -x -o terminfo /usr/src/share/termtypes/termtypes.master "/usr/src/share/termtypes/termtypes.master", line 44

timezone Etc/GMT+1

There was a sign change in /usr/share/zoneinfo/Etc/GMT[+-]* last month. (The Go builder test harness noticed and I confirmed.) Anyone here know if that was an intended change? After some quick search, I'm not regarding it as a bug; StackOverflow has background on the sign ambiguity between POSIX a