EM_CONFIG env variable is ignored or overridden

CuteQt

How do I configure the path for .emscripten config file in Linux?

I can not even scan a simple Web Assembly Qt/QML hello world app, let alone compile it.

It complains em++: error: emscripten config file not found: /home/user/.emscripten.

My .emscripten config file is located in /home/user/tools/emsdk/.emscripten instead.

user@user-desktop:~$ ls $EM_CONFIG
/home/user/tools/emsdk/.emscripten

I have tried setting it up from QtCreator Options Kits, still no success.

How do I force Qt to find .emscripten config file from a different path?