sandbox's configure script first finds readelf, then ignores the path found earlier when checking LIBC version. This leads (on my system) to configure failing with error `configure: error: Unable to determine LIBC VERSION'. A patch fixing the problem follows. (Of course I also needed to put eautoreconf in the ebuild to fix it, but I believe this fix alone will be sufficient in the repository.)
Created attachment 88840 [details, diff] a patch fixing the problem (taking readelf from previously found path)
thanks, merged into subversion