The daily build log MUST be checked before you try using any of these in case there were errors in the build.
The daily build is performed using gcc 4.4.3 on Ubuntu server. The Tcl and Tk source trees are updated from the current fossil heads just before building. This means the binary compatability of these is more restricted than the release binaries which get built from ancient debian based virtual machines. The net result is these daily binaries may not run on your system.