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diff --git a/src/engine/SCons/Tool/aixf77.py b/src/engine/SCons/Tool/aixf77.py
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+++ b/src/engine/SCons/Tool/aixf77.py
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+"""engine.SCons.Tool.aixf77
+
+Tool-specific initialization for IBM Visual Age f77 Fortran compiler.
+
+There normally shouldn't be any need to import this module directly.
+It will usually be imported through the generic SCons.Tool.Tool()
+selection method.
+"""
+
+#
+# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 The SCons Foundation
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#
+
+__revision__ = "src/engine/SCons/Tool/aixf77.py 4577 2009/12/27 19:44:43 scons"
+
+import os.path
+
+#import SCons.Platform.aix
+
+import f77
+
+# It would be good to look for the AIX F77 package the same way we're now
+# looking for the C and C++ packages.  This should be as easy as supplying
+# the correct package names in the following list and uncommenting the
+# SCons.Platform.aix_get_xlc() call the in the function below.
+packages = []
+
+def get_xlf77(env):
+    xlf77 = env.get('F77', 'xlf77')
+    xlf77_r = env.get('SHF77', 'xlf77_r')
+    #return SCons.Platform.aix.get_xlc(env, xlf77, xlf77_r, packages)
+    return (None, xlf77, xlf77_r, None)
+
+def generate(env):
+    """
+    Add Builders and construction variables for the Visual Age FORTRAN
+    compiler to an Environment.
+    """
+    path, _f77, _shf77, version = get_xlf77(env)
+    if path:
+        _f77 = os.path.join(path, _f77)
+        _shf77 = os.path.join(path, _shf77)
+
+    f77.generate(env)
+
+    env['F77'] = _f77
+    env['SHF77'] = _shf77
+
+def exists(env):
+    path, _f77, _shf77, version = get_xlf77(env)
+    if path and _f77:
+        xlf77 = os.path.join(path, _f77)
+        if os.path.exists(xlf77):
+            return xlf77
+    return None
+
+# Local Variables:
+# tab-width:4
+# indent-tabs-mode:nil
+# End:
+# vim: set expandtab tabstop=4 shiftwidth=4: