MONO 3 is stricter when it comes to external references and Do 0.9 thus fails to build with:
[ 202s] make[1]: Entering directory `/home/abuild/rpmbuild/BUILD/gnome-do-0.9/Do.Platform.Linux.JoliCloud'
[ 202s] make[1]: Nothing to be done for `all'.
[ 202s] make[1]: Leaving directory `/home/abuild/rpmbuild/BUILD/gnome-do-0.9/Do.Platform.Linux.JoliCloud'
[ 202s] Making all in Do.Interface.Linux.AnimationBase
[ 202s] make[1]: Entering directory `/home/abuild/rpmbuild/BUILD/gnome-do-0.9/Do.Interface.Linux.AnimationBase'
[ 202s] Compiling Do.Interface.Linux.AnimationBase.dll...
[ 205s] warning CS1701: Assuming assembly reference `Mono.Cairo, Version=2.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756' matches assembly `Mono.Cairo, Version=4.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756'. You may need to supply runtime policy
[ 206s] Compilation succeeded - 1 warning(s)
[ 206s] Generating do.interface.linux.animationbase.pc...
[ 206s] make[1]: Leaving directory `/home/abuild/rpmbuild/BUILD/gnome-do-0.9/Do.Interface.Linux.AnimationBase'
[ 206s] Making all in Do.Interface.Linux.Classic
[ 206s] make[1]: Entering directory `/home/abuild/rpmbuild/BUILD/gnome-do-0.9/Do.Interface.Linux.Classic'
[ 206s] Compiling Do.Interface.Linux.Classic.dll...
[ 207s] ./src/ClassicTheme.cs(25,39): error CS0012: The type `Do.Platform.Linux.IConfigurable' is defined in an assembly that is not referenced. Consider adding a reference to assembly `Do.Platform.Linux, Version=0.11.0.0, Culture=neutral, PublicKeyToken=null'
[ 208s] Compilation failed: 1 error(s), 0 warnings
[ 208s] make[1]: *** [../build/Do.Interface.Linux.Classic.dll] Error 1
[ 208s] make[1]: Leaving directory `/home/abuild/rpmbuild/BUILD/gnome-do-0.9/Do.Interface.Linux.Classic'
[ 208s] make: *** [all-recursive] Error 1
[ 208s] error: Bad exit status from /var/tmp/rpm-tmp.jpZLQ9 (%build)
gnome-do has been failing to build in Factory for a long time