Hi,

Jun T says:
> $ ./configure --program-prefix=g
> $ make
> $ make check
>
> then two tests diff3 and help-version fail.
> The reason is quite simple; the log contains lines like
>
> +diff3: subsidiary program 'gdiff' not found

I noticed this since I use --program-prefix=g too. More generally
--program-{prefix,suffix} are simpler forms of
--program-transform-name.

The error is because the sed pattern given to that option is only used
on the executable after 'make install'. I've attached a patch that
invokes diff3 and sdiff with --diff-program=diff which should make the
tests pass regardless of the options passed to ./configure.

Collin