You can clone with
HTTPS or Subversion.
This is mostly a FYI and a reference for others: as reported in http://code.google.com/p/google-perftools/issues/detail?id=301, building perftools 1.6.0 fails with gcc 4.6. As such, perftools.rb will also fail to install on a system with gcc 4.6 as the default, or only, gcc.
Current master branch state fixes this one