Project ERROR: Cannot run target compiler 'em++'.

agent:2019/09/06 10:41:31 build.go:220: Info: creating cache file C:\Users\qt\work\qt\qtbase\.qmake.cache
agent:2019/09/06 10:41:32 build.go:220: Command line: -opensource -confirm-license -verbose -prefix c:\Users\qt\work\install -release -nomake examples -nomake tests -no-feature-thread -static -no-dbus -no-headersclean -no-ssl -no-warnings-are-errors -no-pch -platform win32-g++ -xplatform wasm-emscripten
agent:2019/09/06 10:41:32 build.go:220: Project ERROR: Cannot run target compiler 'em++'. Output:
agent:2019/09/06 10:41:32 build.go:220: ===================
agent:2019/09/06 10:41:32 build.go:220: ===================
agent:2019/09/06 10:41:32 build.go:220: Maybe you forgot to setup the environment?
agent:2019/09/06 10:41:32 build.go:253: Process finished with error: exit status 3
agent:2019/09/06 10:41:32 build.go:223: Error reading from stdout/err: exit status 3
agent:2019/09/06 10:41:32 build.go:471: Executing scheduled instruction 1 of 1 - Upload all core dumps if there are some
agent:2019/09/06 10:41:32 build.go:384: Skipping uploadCoreFiles() because CORE_FILES_PATH is not set