Bug#628515: recommending verbose build logs

[Jonathan Nieder <jrnieder@gmail.com>]

Some notes for completeness.

Matthias Klose wrote:

>  - cmake: VERBOSE=1 (?)

Yes, or "cmake -DCMAKE_VERBOSE_MAKEFILE=1" at configure time.

>  - automake: V=1

As KiBi mentioned, --disable-silent-rules at configure time works,
too.

>  - linux kernel: V=1

The KBUILD_VERBOSE environment variable determines the default
behavior.