POSTIN
/bin/sh
update-alternatives --install /usr/bin/xsidplay xsidplay /usr/bin/xsidplay-libsidplay1 10 [ -e /usr/bin/xsidplay ] || update-alternatives --auto xsidplay
POSTUN
/bin/sh
[ "$1" = "0" ] || exit 0 update-alternatives --remove xsidplay /usr/bin/xsidplay-libsidplay1