libmono-cil-dev - 6.8.0.105+dfsg-3.3~deb11u1 main

This package contains development headers for the Mono Base Class Libraries.
.
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.