see if symlink works now

bin/compile

@@ -162,6 +162,7 @@ if [[ $BUILD_DIR != '/app' ]]; then
     ln -s $BUILD_DIR/.heroku/python /app/.heroku/python
     ln -s $BUILD_DIR/.heroku/vendor /app/.heroku/vendor
     ln -s $BUILD_DIR/.heroku/venv /app/.heroku/venv
+    ln -s $BULD_DIR/.heroku/src /app/.heroku/src
 fi
 
 # Install Python.
@@ -208,9 +209,6 @@ set-default-env PYTHONPATH /app/
 # Install sane-default script for $WEB_CONCURRENCY and $FORWARDED_ALLOW_IPS.
 cp $ROOT_DIR/vendor/python.gunicorn.sh $GUNICORN_PROFILE_PATH
 
-# Deep copy the directory for -e pip installations
-deep-cp /app/.heroku/src $BUILD_DIR/.heroku/src
-
 # Experimental post_compile hook.
 bpwatch start post_compile
   source $BIN_DIR/steps/hooks/post_compile