compile of mono-0.30/0.30.1 had unresolved compile errors. mono-0.30.2 compiled and works perfectly for me. Just copied the 0.30.1 emerge to the 0.30.2 version, ran ebuild [] digest. And off we go. Also for some reason my "emerge -DU world" allowed the system to backlevel me to mono-0.28. Thanks for all your efforts!
search please *** This bug has been marked as a duplicate of 43745 ***