mingw-w64 6.0.0-4 (amd64 binary) in ubuntu focal

 MinGW-w64 provides a development and runtime environment for 32- and
 64-bit (x86 and x64) Windows applications using the Windows API and
 the GNU Compiler Collection (gcc).
 .
 This metapackage provides the MinGW-w64 development environment,
 including C and C++ compilers. Ada, Fortran, Objective-C and
 Objective-C++ compilers are available respectively in the
 gnat-mingw-w64, gfortran-mingw-w64, gobjc-mingw-w64 and
 gojbc++-mingw-w64 packages.