Can't build Unreal Engine 4 on Debian Testing

I got this after running Setup.sh:
Registering git hooks… (this will override existing ones!)
Attempting installation of missing package: libmono-corlib4.0-cil

  • sudo apt-get install -y libmono-corlib4.0-cil

    Package libmono-corlib4.0-cil is not available, but is referred to by another package.
    This may mean that the package is missing, has been obsoleted, or
    is only available from another source
    However the following packages replace it:
    mono-devel