I just noticed that master has been failing my overnight build for a while, in the make distcheck step; see http://www.ossau.uklinux.net/guile/snapshots/guile-master-20090524.log. It looks like something to do with pkgconfig / guile-config / looking for an uninstalled guile in the wrong place when the build dir is different from the src dir. I probably won't get to this for a while, so if someone else could look into it, that would be great.
Regards, Neil