cannot install gfortran-lion-5666-3.pkg

As a test I downloaded and tried to install gfortran-lion-5666-3.pkg. It does not like the fact that Xcode 4.1 comes with gcc build 5658, rather than 5666.3, and it does not install.

Lion, Xcode 4.1

gcc --version
i686-apple-darwin11-llvm-gcc-4.2 (GCC) 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2335.15.00)
Copyright (C) 2007 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.