Page R tools for OS X (http://r.research.att.com/tools/) says:

gcc-4.2 (Apple build 5666.3) with GNU Fortran 4.2.4 for Mac OS X 10.7 (Lion):
Download: gcc-42-5666.3-darwin11.pkg (for Xcode 4.2 and higher)

But the Fortran that it installs is 4.2.1, not 4.2.4:

~$ gfortran --version
GNU Fortran (GCC) 4.2.1 (Apple Inc. build 5666) (dot 3)
Copyright (C) 2007 Free Software Foundation, Inc.

GNU Fortran comes with NO WARRANTY, to the extent permitted by law.
You may redistribute copies of GNU Fortran
under the terms of the GNU General Public License.
For more information about these matters, see the file named COPYING

Davor
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