Qt5.15.15
Compiled on Lubuntu 20.04 64-bit
GLIBC 2.31
GCC 9.4.0
openSSL 3.3.1

 ../qt-everywhere-src-5.15.15/configure -release -prefix "/opt/Qt/5.15.15/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
make install