./emcc -v
emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 2.0.26 (5af6a11)
clang version 13.0.0 (https://github.com/llvm/llvm-project 31e75512174e1bdaa242ee5c7f30fe56e68c3748)
Target: wasm32-unknown-emscripten
Thread model: posix
InstalledDir: /code/emsdk/upstream/bin

After using the command source ./emsdk_env.sh I still cannot find emcc
must using cd to emcc's path
When I build opencv prompt
EMSCRIPTEN environment variable is not available. Please properly activate Emscripten SDK and consider using 'emcmake' launcher