diff --git a/Dockerfile b/Dockerfile
index e6a3bf8..b246ec5 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -9,10 +9,13 @@ ARG ANDROID_NDK_VERSION="21.3.6528147"
 
 WORKDIR /workspace
 
-RUN export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64 && \
+RUN echo "**** setup environment ****" && \
+    export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64 && \
     export PATH=$JAVA_HOME/bin:$PATH && \
     export QT_EVERYWHERE_URL="https://download.qt.io/archive/qt/${QT_VERSION_FAMILY}/${QT_VERSION}/single/qt-everywhere-opensource-src-${QT_VERSION}.tar.xz" && \
     export ANDROID_CLI_TOOLS_URL="https://dl.google.com/android/repository/commandlinetools-linux-8512546_latest.zip" && \
+    \
+    echo "**** install dependencies ****" && \
     dpkg --add-architecture i386 && \
     apt-get update && \
     DEBIAN_FRONTEND=noninteractive apt-get install -y wget openjdk-8-jdk tar xz-utils unzip libstdc++6:i386 libgcc1:i386 zlib1g:i386 libncurses5:i386 make g++ perl python3 git '^libxcb.*-dev' libx11-xcb-dev libglu1-mesa-dev libxrender-dev libxi-dev libxkbcommon-dev libxkbcommon-x11-dev flex bison gperf libicu-dev libxslt-dev ruby libxcursor-dev libxcomposite-dev libxdamage-dev libxrandr-dev libxtst-dev libxss-dev libdbus-1-dev libevent-dev libfontconfig1-dev libcap-dev libpulse-dev libudev-dev libpci-dev libnss3-dev libasound2-dev libegl1-mesa-dev gperf bison nodejs libasound2-dev libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev libgstreamer-plugins-good1.0-dev libgstreamer-plugins-bad1.0-dev && \