When compiling a program these are the following errors that appear... run info '(automake)Extending aclocal' or see http://sources.redhat.com/automake/automake.html#Extending%20aclocal /usr/share/aclocal/audiofile.m4:12: warning: underquoted definition of AM_PATH_AUDIOFILE
Needs to be fixed upstream... Also, those are not errors but harmless warnings (see the link).
The point of these bugs was for someone to follw up with it upstream.
Vapier fixed quite a few of time ago. Re-emerge the package, as it was not revbumped.