emconfigure 2> /dev/null ||{echo'emconfigure not found. Install emsdk and add emconfigure and emmake to PATH environment variable. See instruction at https://kripken.github.io/emscripten-site/docs/getting_started/downloads.html. Do not forget to add `emconfigure` and `emmake` to the PATH environment variable via `emsdk/emsdk_env.sh` script.';exit 1;}