There's a recommended version (0.2.0+ currently) and also
the minimal version, 0.1.7, which received the important fixes.
It was proposed by nice antique@ folks IIRC.

Unfortunately the "suboptimal version" warning is pretty modest,
and "minimal version" error will be apparent with DEBUG enabled;
still the latter will terminate the downstream build and leave
a clear message in build.log at any rate.