valgrind does not install under Xcode 8 (macOS Sierra)

[roberthuston@…]

After upgrading to macOS Sierra and to Xcode 8, I performed the initial migration operations for MacPorts. When I get to installing valgrind, I get an error that OS 10.12 isn't supported (Darwin 16). Changing the "${os.major} > 15" check to be "${os.major} > 16" in the Portfile allows MacPorts to pull down the valgrind-3.11.0.tar.bz2 file. However, I then get a configuration failure:

:info:configure checking for a supported version of gcc... no (8.0.0) :info:configure configure: error: please use gcc >= 3.0 or clang >= 2.9 or icc >= 13.0

I don't know what to modify in the patch files to get things to work correctly.