libmono-system4.0-cil - 6.12.0.199+dfsg-2 main

Mono is a platform for running and developing applications based on the
ECMA/ISO Standards. Mono is an open source effort led by Xamarin.
Mono provides a complete CLR (Common Language Runtime) including compiler and
runtime, which can produce and execute CIL (Common Intermediate Language)
bytecode (aka assemblies), and a class library.
.
This package contains the BCL (Base Class Libraries) of Mono for CLI 4.0.