diff --git a/povray_wasm/Dockerfile b/povray_wasm/Dockerfile
index 8d888b1..d53a7cf 100644
--- a/povray_wasm/Dockerfile
+++ b/povray_wasm/Dockerfile
@@ -19,6 +19,7 @@ RUN cd /opt/boost && git submodule update --init --recursive
 RUN mkdir -p /opt/libboost_build
 RUN mkdir -p /opt/libboost
 
+RUN cd /opt/boost && ls
 RUN cd /opt/boost && ./bootstrap.sh --with-libraries=system,date_time,filesystem,thread
 
 RUN cd /opt/boost && ./b2 -j4 toolset=emscripten \