Mine

#!/bin/sh

  RPM_SOURCE_DIR="/home/xen/rpm/sources"
  RPM_BUILD_DIR="/home/xen/rpm/build"
  RPM_OPT_FLAGS="-O3 -g -pipe -fomit-frame-pointer -march=i386 -mcpu=i686"
  RPM_ARCH="i386"
  RPM_OS="linux"
  export RPM_SOURCE_DIR RPM_BUILD_DIR RPM_OPT_FLAGS RPM_ARCH RPM_OS
  RPM_DOC_DIR="/usr/share/doc"
  export RPM_DOC_DIR
  RPM_PACKAGE_NAME="nufw"
  RPM_PACKAGE_VERSION="1.0.2"
  RPM_PACKAGE_RELEASE="1"
  export RPM_PACKAGE_NAME RPM_PACKAGE_VERSION RPM_PACKAGE_RELEASE
  RPM_BUILD_ROOT="/home/xen/rpm/tmp/nufw-1.0.2-1-root"
  export RPM_BUILD_ROOT


  set -x
  umask 022
  cd /home/xen/rpm/build
LANG=C
export LANG
unset DISPLAY
^M
cd /home/xen/rpm/build
rm -rf nufw-1.0.2
/usr/bin/bzip2 -dc /home/xen/rpm/sources/nufw-1.0.2.tar.bz2 | tar -xf -
STATUS=$?
if [ $STATUS -ne 0 ]; then
  exit $STATUS
fi
cd nufw-1.0.2
# -------------------------------------------------------------------- #^M

exit 0