Bug#840974: samtools: FTBFS: configure.ac:69: error: macro PKG_CHECK_EXISTS is not defined; is a m4 file missing?

[Sascha Steinbiss]

Hi.

[...]
>> Thanks. This has fixed the problem for me. Is this solution OK for
everyone?
>
> Fine for me

OK, I'll upload later.

Cheers
Sascha