Wrong version displayed in documentation pdfs

[Freddie Chopin]

Hi!

When building pdf documentation for libc and libm out of the most
recent package (2.5.0), the version on front page in both document says
2.2.0 with "December 2014" date.

Is there any way to make this value automatic, so it wouldn't have to
be updated with each release?

$ grep -R '2\.2\.0'
libm/libm.texinfo:@subtitle @code{libm} 2.2.0
libc/libc.texinfo:@subtitle @code{libc} 2.2.0
...
$ grep -R 'December 2014'
libm/libm.texinfo:@subtitle December 2014
libc/libc.texinfo:@subtitle December 2014

Regards,
FCh