Excerpts from mail: 5-Mar-101 Re: warning: null format st.. by Ignatios
Souvatzis@netbs 
> cmg didn't read UPGRADING, and failed miserably.
Wrong. There's no specific information about rebuilding compilers for
this problem, and I had already built make and yacc. The generic advice
about rebuilding the compiler if "Unreasonable compiler errors" occur
did not necessarily apply, as the error did not seem unreasonable.

> Basically, you need to FIRST build a new compiler and install it, THEN a 
> make build.
Which I cannot do, as this is sparc64. Apparently the mainline toolchain
is not considered useful there (at least gnu/usr.bin/egcs/Makefile won't
build any compiler components on sparc64).