POSTIN
/bin/sh
update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.0.0 200400 [ -e /usr/bin/gcc ] || update-alternatives --auto gcc
POSTUN
/bin/sh
if [ ! -f /usr/bin/gcc-4.0.0 ]; then update-alternatives --remove gcc /usr/bin/gcc-4.0.0 fi