diff --git a/builder/image-ros.sh b/builder/image-ros.sh
index 48f9fa94..ffa650d7 100755
--- a/builder/image-ros.sh
+++ b/builder/image-ros.sh
@@ -112,10 +112,14 @@ my_travis_retry pip3 install wheel
 my_travis_retry pip3 install -r /home/pi/catkin_ws/src/clover/clover/requirements.txt
 source /opt/ros/${ROS_DISTRO}/setup.bash
 
+tree
+
 # At first whitelist nothing to initialize the workspace:
 catkin_make -DCATKIN_WHITELIST_PACKAGES="<nothing>"
 source devel/setup.bash
 
+tree
+
 # Build everything:
 catkin_make -j2 -DCMAKE_BUILD_TYPE=RelWithDebInfo -DCATKIN_WHITELIST_PACKAGES=""