shouldn't be a surprise ;) checking the GLIBC_VERSION version... unsupported version 2.15 configure: error: Valgrind requires glibc version 2.2 - 2.14
Please test valgrind-3.7.0-r2. I patched configure.in to allow 2.15 as we've done in the past. It should begin to build, however I don't have a glibc-2.15 test box and I'm not sure if it won't hit some other problem later.
seems to be sufficient for now ;)