Given the work done by Benjamin Johnson around 2010 and 2013 to port Dillo to Windows and DOS, it may be worth evaluating if it would be doable to merge patches into mainline, so we at least can build Dillo natively in Windows.

https://sourceforge.net/projects/dplus-browser/

From the README:

3. Compatibility
----------------

  - Microsoft Windows 95, 98, Me, NT 4.0, 2000, XP, Vista, and 7,
    including all x64 versions.

  - Microsoft Windows NT 3.51, using a specialized build.

  - DOS and compatible systems (tested mainly on MS-DOS 6.22 and FreeDOS).

  - All recent Linux/Unix systems.  Linux binary packages are available
    for current CentOS, Debian, Fedora, openSUSE, RHEL, and Ubuntu releases.

  - Mac OS X should work, but has not been tested by the developer.
    Mainline Dillo has been reported to run fine.

  - Theoretically any other platform with a sockets library and FLTK 1.3.

I don't think it would be possible to guarantee that support on those platforms won't be broken, but it may be doable to support them on a best-effort basis. It seems that MinGW can cross compile Dillo for Windows from a UNIX machine, which would be enough for us.