[f2py] Problems with f2py callback example 64bit ubuntu

I am having trouble in getting f2py callback example to on my 64bit
installation of ubuntu (both 9.04 and 9.10). I have had no trouble on my
32bit installation of ubuntu(9.04). The example I have been trying to get
work is from the pdf and is as follows.

 C FILE: CALLBACK.F
      SUBROUTINE FOO(FUN,R)
      EXTERNAL FUN
      INTEGER I
      REAL*8 R
Cf2py intent(out) r
      R = 0D0
      DO I=-5,5
         R = R + FUN(I)
      ENDDO
      END
C END OF FILE CALLBACK.F

I compiled this using :
f2py$ f2py -c callback.f -m callback

This is my build log
running build
running config_cc
unifing config_cc, config, build_clib, build_ext, build commands --compiler
options
running config_fc
unifing config_fc, config, build_clib, build_ext, build commands --fcompiler
options
running build_src
building extension "callback" sources
f2py options: []
f2py:> /tmp/tmpi5QIEz/src.linux-x86_64-2.6/callbackmodule.c
creating /tmp/tmpi5QIEz
creating /tmp/tmpi5QIEz/src.linux-x86_64-2.6
Reading fortran codes...
    Reading file 'callback.f' (format:fix,strict)
Post-processing...
    Block: callback
            Block: foo
                    Block: fun
Post-processing (stage 2)...
Building modules...
    Constructing call-back function "cb_fun_in_foo__user__routines"
      def fun(i): return r
    Building module "callback"...
        Constructing wrapper function "foo"...
          r = foo(fun,[fun_extra_args])
    Wrote C/API module "callback" to file
"/tmp/tmpi5QIEz/src.linux-x86_64-2.6/callbackmodule.c"
  adding '/tmp/tmpi5QIEz/src.linux-x86_64-2.6/fortranobject.c' to sources.
  adding '/tmp/tmpi5QIEz/src.linux-x86_64-2.6' to include_dirs.
copying /usr/lib/python2.6/dist-packages/numpy/f2py/src/fortranobject.c ->
/tmp/tmpi5QIEz/src.linux-x86_64-2.6
copying /usr/lib/python2.6/dist-packages/numpy/f2py/src/fortranobject.h ->
/tmp/tmpi5QIEz/src.linux-x86_64-2.6
running build_ext
customize UnixCCompiler
customize UnixCCompiler using build_ext
customize GnuFCompiler
Could not locate executable g77
Could not locate executable f77
customize IntelFCompiler
Could not locate executable ifort
Could not locate executable ifc
customize LaheyFCompiler
Could not locate executable lf95
customize PGroupFCompiler
Could not locate executable pgf90
Could not locate executable pgf77
customize AbsoftFCompiler
Could not locate executable f90
customize NAGFCompiler
Found executable /usr/bin/f95
customize VastFCompiler
customize GnuFCompiler
customize CompaqFCompiler
Could not locate executable fort
customize IntelItaniumFCompiler
Could not locate executable efort
Could not locate executable efc
customize IntelEM64TFCompiler
customize Gnu95FCompiler
Found executable /usr/bin/gfortran
customize Gnu95FCompiler
customize Gnu95FCompiler using build_ext
building 'callback' extension
compiling C sources
C compiler: gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall
-Wstrict-prototypes -fPIC

creating /tmp/tmpi5QIEz/tmp
creating /tmp/tmpi5QIEz/tmp/tmpi5QIEz
creating /tmp/tmpi5QIEz/tmp/tmpi5QIEz/src.linux-x86_64-2.6
compile options: '-I/tmp/tmpi5QIEz/src.linux-x86_64-2.6
-I/usr/lib/python2.6/dist-packages/numpy/core/include
-I/usr/include/python2.6 -c'
gcc: /tmp/tmpi5QIEz/src.linux-x86_64-2.6/callbackmodule.c
gcc: /tmp/tmpi5QIEz/src.linux-x86_64-2.6/fortranobject.c
compiling Fortran sources
Fortran f77 compiler: /usr/bin/gfortran -Wall -ffixed-form
-fno-second-underscore -fPIC -O3 -funroll-loops
Fortran f90 compiler: /usr/bin/gfortran -Wall -fno-second-underscore -fPIC
-O3 -funroll-loops
Fortran fix compiler: /usr/bin/gfortran -Wall -ffixed-form
-fno-second-underscore -Wall -fno-second-underscore -fPIC -O3 -funroll-loops
compile options: '-I/tmp/tmpi5QIEz/src.linux-x86_64-2.6
-I/usr/lib/python2.6/dist-packages/numpy/core/include
-I/usr/include/python2.6 -c'
gfortran:f77: callback.f
/usr/bin/gfortran -Wall -Wall -shared
/tmp/tmpi5QIEz/tmp/tmpi5QIEz/src.linux-x86_64-2.6/callbackmodule.o
/tmp/tmpi5QIEz/tmp/tmpi5QIEz/src.linux-x86_64-2.6/fortranobject.o
/tmp/tmpi5QIEz/callback.o -lgfortran -o ./callback.so
running scons
Removing build directory /tmp/tmpi5QIEz

When I run in python my output is as follows

>>> import callback
>>> def f(i): return i*i
...
>>> print callback.foo(f)
0.0
>>>

The routing callback.foo(f) should be returning 110.0

Any help with this problem will be greatly appreciated.

Regards,
Chris.

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