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diff --git a/backport b/backport
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+#!/bin/bash
+
+# Script to automate backporting for CRAN
+# Creates a source package and binary packages for the following architecture
+ARCH=i386
+export ARCH
+
+# R version against which the software is compiled
+Rversion=3.2.3
+reposversion="cran3"
+
+# Where the buildresults should be stored
+rcrandir=/home/jranke/svn/website/www/ranke/r-cran
+
+# Author: Johannes Ranke <jranke@uni-bremen.de>
+
+# Preconditions: 
+#  - up to date R version specified above, for packages depending on R
+#  - sudo and pbuilder configuration (see README)
+#  - sid sources in /etc/apt/sources/list
+#  - cdbs installed (and maybe more)
+#  - shell variables DEBEMAIL and DEBFULLNAME
+
+usage()
+{
+echo "Usage: ./backport [options] sourcepackage squeeze|wheezy|jessie"
+echo "Options:"
+echo " -n     Skip apt-get update/upgrade and pbuilder update"
+}
+
+update=true
+while getopts ":n" flag; do
+  case $flag in
+    n)
+      update=false
+      ;;
+    \?)
+      echo "Invalid option: -$OPTARG" >&2
+      ;;
+  esac
+  shift $((OPTIND-1))
+done
+
+# Check for number of arguments
+if [ $# -lt 2 ]; then usage; exit 1; fi
+pkg=$1
+DIST=$2
+
+# Validate distribution argument
+if [ $DIST != "squeeze" ] && [ $DIST != "wheezy" ] && [ $DIST != "jessie" ]; then usage; exit 1; fi
+export DIST
+
+# Set required r-base-dev version for packages build-depending on R
+rbasedev="r-base-dev (>= $Rversion)"
+
+# Remove previously extracted sources
+if [ -d $pkg-* ]
+then
+    sudo rm -rf `ls -d $pkg-*`
+fi
+
+# Get current source from unstable
+if [ "$update" = true ]
+then
+  sudo apt-get update
+  sudo apt-get upgrade
+fi
+sudo apt-get source $pkg
+
+# Copy sources to $DIST directory to enable parallel builds
+mkdir -p $DIST
+cp -r $pkg-* $DIST
+
+# Go to package building directory
+cd $DIST/$pkg-*
+
+# Determine the version of the Debian package
+oldversion=`dpkg-parsechangelog | grep ^Version | cut -f2 -d " "`
+cranversion=$oldversion"~"$DIST"cran.0"
+
+echo Old version is $oldversion
+echo CRAN version is $cranversion
+
+# Add new version to changelog
+dch -v "${cranversion}" --force-distribution -D $DIST-cran -b "Backport from Debian unstable to Debian $DIST"
+
+# Adapt build dependency on r-base-dev if present
+if grep -q "^Build-Depends.*r-base-dev" debian/control
+then 
+    echo "Lowering Build-Depends to $rbasedev"    
+    ssed -i -R "/^Build-Depends/s/r-base-dev \(>= .*?\)/$rbasedev/" debian/control
+    ssed -i -R "/^Build-Depends-Indep/s/r-base-dev \(>= .*?\)/$rbasedev/" debian/control
+
+    dch -a "debian/control: adapt build dependencies on r-base-dev to current backport"
+fi
+
+# Check for a script doing modifications required for backporting
+script=../$pkg-reverts.sh
+
+if [ -f $script ]; then source $script; fi
+
+if [ "$update" = true ]
+then
+  sudo -E pbuilder update
+fi
+sudo -E pdebuild --debbuildopts '-sa' \
+  --buildresult $rcrandir/$DIST-cran3/ \
+  -- --distribution $DIST --basetgz /var/cache/pbuilder/$DIST-$ARCH-base.tgz \
+     --aptcache /var/cache/pbuilder/$DIST-$ARCH/aptcache \
+     --buildplace /var/cache/pbuilder/$DIST-$ARCH/build
+if [ $? -ne 0 ]; then
+    exit 
+fi
+
+cd ..