[nomerge       ] dev-lang/mono-4.4.1.0::gentoo  USE="nls (-doc) -minimal -pax_kernel -xen" ABI_X86="32 (64) (-x32)"
[ebuild  N     ]  dev-dotnet/libgdiplus-4.2-r2::gentoo  USE="cairo" 672 KiB
[ebuild  N     ]   dev-lang/mono-4.4.1.0::gentoo  USE="nls (-doc) -minimal -pax_kernel -xen" ABI_X86="32 (64) (-x32)" 83,885 KiB

Total: 2 packages (2 new), Size of downloads: 84,556 KiB

 * Error: circular dependencies:

(dev-dotnet/libgdiplus-4.2-r2:0/0::gentoo, ebuild scheduled for merge) depends on
 (dev-lang/mono-4.4.1.0:0/0::gentoo, ebuild scheduled for merge) (buildtime)
  (dev-dotnet/libgdiplus-4.2-r2:0/0::gentoo, ebuild scheduled for merge) (buildtime)

It might be possible to break this cycle
by applying the following change:
- dev-lang/mono-4.4.1.0 (Change USE: +minimal)

Note that this change can be reverted, once the package has been installed.