well, I have installed the libao-devel package. Thanks for the tip because I was thinking that libao and libao-devel was different versions of the same...Before installing I checked the ao.m4 file you told about and it didn't exist. I'm very happy for having this new file now.
but, this is what I get with the first step in the build process:
[root@castejon btsco]# ./bootstrap /usr/share/aclocal/ao.m4:9: warning: underquoted definition of XIPH_PATH_AO run info '(automake)Extending aclocal' or see http://sources.redhat.com/automake/automake.html#Extending-aclocal
uf! running info '(automake)Extending aclocal' is all but explanatory...
This is only a warning message; you can ignore it. It's just complaining about a lack of square brackets in the definition of XIPH_PATH_AO in /usr/share/aclocal/ao.m4, which may cause problems with later versions of automake.
Paul.