Recently Mono was changed to depend on libgdiplus. This is undesired for servers that do not use a graphical environment. Since Mono is usable without libgdiplus, it's dependency should be tied to a USE flag. Reproducible: Always Steps to Reproduce: emerge mono
Ok, marking this FIXED. I've put this behind the X USE flag, which although not perfect, captures the essence of the problem (People with servers don't want to have to install X for libgdiplus, etc to just use mono). Thanks for the report.