python install and fortran

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I want to install the package PyNIO with sage 5.3

The problem occurs with the fortran compiler. When doing

sage --python setup.py install

I get following errors

customize UnixCCompiler

customize UnixCCompiler using build_clib

customize GnuFCompiler

Found executable /srv/gluster/home/mathieu/opt/sage-5.3-linux-64bit-ubuntu_10.04.4_lts-x86_64-Linux/local/bin/gfortran

gnu: no Fortran 90 compiler found

Found executable /usr/bin/ld

Found executable /usr/bin/ar

Found executable /usr/bin/ranlib

gnu: no Fortran 90 compiler found

customize IntelFCompiler

Found executable /opt/intel/composer_xe_2011_sp1/bin/ifort

customize LaheyFCompiler

Could not locate executable lf95

customize PGroupFCompiler

Could not locate executable pgf90

customize AbsoftFCompiler

customize NAGFCompiler

customize VastFCompiler

customize CompaqFCompiler

customize IntelItaniumFCompiler

customize IntelEM64TFCompiler

customize Gnu95FCompiler

customize G95FCompiler

don't know how to compile Fortran code on platform 'posix'

building 'nio' library

error: library nio has Fortran sources but no Fortran compiler found

On the other hand when I try to install on a Python 2.7.3 installed in my home directory using

python setup.py install

there is apparently no error at all:

customize UnixCCompiler

customize UnixCCompiler using build_clib

customize GnuFCompiler

Found executable /opt/intel/composer_xe_2011_sp1/bin/ifort

gnu: no Fortran 90 compiler found

Could not locate executable g77

Could not locate executable f77

gnu: no Fortran 90 compiler found

customize IntelFCompiler

customize LaheyFCompiler

Could not locate executable lf95

customize PGroupFCompiler

Could not locate executable pgfortran

customize AbsoftFCompiler

customize NAGFCompiler

customize VastFCompiler

customize CompaqFCompiler

customize IntelItaniumFCompiler

customize IntelEM64TFCompiler

customize IntelEM64TFCompiler

customize IntelEM64TFCompiler using build_clib

building 'nio' library

compiling C sources

What could explain this difference in behavior between using sage alone and using Python 2.7.3?

Best,

Mathieu