MinGW 32-bit, GCC 8.1.0, Windows 10 32-bit

Qt5.15.16

SET PATH=C:\Qt\Qt\Tools\mingw810_32\bin;C:\Qt\BUILD\qt-everywhere-src-5.15.16\qtbase\bin;%PATH%

..\qt-everywhere-src-5.15.16\configure.bat -release -prefix "C:\Qt\5.15.16\mingw810_32" -opensource -confirm-license -silent -make libs -nomake examples -nomake tests -make tools -skip qtwebengine -platform win32-g++ -opengl desktop -openssl-runtime OPENSSL_PREFIX="C:\Program Files\OpenSSL" 

mingw32-make
mingw32-make install