Qt5.15.17
Compiled on Lubuntu 20.04 64-bit
GLIBC 2.31
GCC 9.4.0


 ../qt-everywhere-src-5.15.17/configure -release -prefix "/opt/Qt/5.15.17/gcc_64" -opensource -confirm-license -silent -qt-zlib -qt-pcre -qt-libpng -qt-libjpeg -system-freetype -opengl desktop -make libs -make tools -flite -openssl-runtime OPENSSL_PREFIX="/opt/Qt/Tools/OpenSSLv3/src"

make -j6
make install