1mkdir -p /opt/dev \ 2&& cd /opt/dev \ 3&& git clone https://github.com/emscripten-core/emsdk.git \ 4&& cd /opt/dev/emsdk \ 5&& git reset --hard 0fde04880048f743056bed17cb0543a42e040fae \ 6&& ./emsdk install 3.1.55 \ 7&& ./emsdk activate 3.1.55 8 9