MinGW GCC 8.1.0, Windows 10 64-bit

Qt5.15.13

SET PATH=C:\Qt\Tools\mingw810_64\bin;C:\Users\posktomten\Downloads\BUILD\qt-everywhere-src-5.15.13\qtbase\bin;%PATH%

 ..\qt-everywhere-src-5.15.13\configure.bat OPENSSL_LIBS="-llibcrypto -llibssl" -I "C:\Qt\Tools\OpenSSL\Win_x64\include" -L "C:\Qt\Tools\OpenSSL\Win_x64\lib" -release -prefix "C:\Qt\5.15.13\mingw81_64" -opensource -confirm-license -silent -make libs -nomake examples -nomake tests -make tools -skip qtwebengine -platform win32-g++ -opengl desktop -openssl-linked