MISSING_PKGS=$(dpkg-checkbuilddeps |& perl -pe 's/^.+://g; s/\(.*?\)//g')
-sudo apt-get install -y ${MISSING_PKGS} devscripts
+sudo apt-get update
+sudo apt-get install -y ${MISSING_PKGS} devscripts pristine-tar
pkg_version=$(dpkg-parsechangelog --show-field Version)
orig_version=$(echo ${pkg_version} | sed s'/-.*//')