To build on macOS you'll need to install Homebrew and then install the necessary dependencies:
brew install qt5
brew install openssl
You may need to update your PATH:
export PATH="/opt/homebrew/opt/qt@5/bin:$PATH"
Then:
OPENSSL_PREFIX=`brew --prefix openssl`;
qmake INCLUDEPATH+="$OPENSSL_PREFIX/include" \
LIBS+="-L$OPENSSL_PREFIX/lib -lcrypto"
make
To run the application from the command line:
% build/weatherfxLite.app/Contents/MacOS/weatherfxLite