message: Make build_pip_package.sh work with relative paths.
diff: set -e
  +function real_path() {
  + [[ $1 = /* ]] && echo "$1" || echo "$PWD/${1#./}"
  +}
  +
  function cp_external() {
  local src_dir=$1
  local dest_dir=$2
  @@ -41,7 +45,7 @@ function main() {
  exit 1
  fi
  - DEST=$1
  + DEST=$(real_path $1)
  TMPDIR=$(mktemp -d -t tmp.XXXXXXXXXX)
  GPU_FLAG=""
  