POSTIN

/bin/sh

/usr/sbin/update-alternatives --install /usr/bin/gfortran gfortran /usr/bin/gfortran-4.2.3 300402 --slave /usr/bin/f95 f95 /usr/bin/gfortran-4.2.3
[ -e /usr/bin/gfortran ] || /usr/sbin/update-alternatives --auto gfortran

POSTUN

/bin/sh

if [ ! -f /usr/bin/gfortran-4.2.3 ]; then
  /usr/sbin/update-alternatives --remove gfortran /usr/bin/gfortran-4.2.3
fi