automake + .info files help needed

[Matěj Týč]

Hello,
I use Texinfo to document my project and I have a foo.texi file in doc/
subdirectory.
I have these lines in the doc/Makefile.am:

info_TEXINFOS = foo.texi

EXTRA_DIST  = images/foo1.png etc.

I also have the doc/ directory and makefile "registered" in root
Makefile.am and in configure.ac

makeinfo foo.texi ends successfully with some warnings only (=> the info
file can be built if someone tries to).

The question is: I have found out that automake should build
appropriate .info file and distribute it. This does not happen and I
have spent quite a lot of time to figure out what's wrong, but the
Autoconf and Texinfo manuals weren't of much use regarding this.

make distcheck of course fails because of this...

Do you have a clue what can be wrong?
Regards,
Matěj