Ultima Online Server
Typical Windows Build
PS C:\runuo> C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc /optimize /unsafe /t:exe /out:RunUO.exe /win32icon:Server\runuo.ico /recurse:Server\\*.cs
Typical Linux Build (MONO)
~/runuo$ dmcs -optimize+ -unsafe -t:exe -out:RunUO.exe -win32icon:Server/runuo.ico -nowarn:219,414 -d:MONO -recurse:Server/*.cs
zlib is required for certain functionality. Windows zlib builds are packaged with releases and can also be obtained separately here.
RunUO supports Intel's hardware random number generator (Secure Key, Bull Mountain, rdrand, etc). If rdrand32.dll/rdrand64.dll are present in the base directory and the hardware supports that functionality, it will be used automatically. You can find those libraries here.
Additional Resources
IRC: chat.freenode.net #runuo