Atatched patch updates Mono to the latest stable release, 1.0.4. Port is set to IGNORE on 5.x if OSVERSION is below 503000. Mono 1.0.1 and greater have been broken on earlier OSVERSION versions.
Responsible Changed From-To: freebsd-ports-bugs->mezz I'll take this.
State Changed From-To: open->closed Committed, thanks!