/usr/lib/mono/ is in fsharp 4.0.0.4+dfsg2-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/mono/Microsoft SDKs/
/usr/lib/mono/Microsoft SDKs/F#/
/usr/lib/mono/Microsoft SDKs/F#/4.0/
/usr/lib/mono/Microsoft SDKs/F#/4.0/Framework/
/usr/lib/mono/Microsoft SDKs/F#/4.0/Framework/v4.0/
/usr/lib/mono/Microsoft SDKs/F#/4.0/Framework/v4.0/Microsoft.FSharp.Targets
/usr/lib/mono/Microsoft SDKs/F#/4.0/Framework/v4.0/Microsoft.Portable.FSharp.Targets
/usr/lib/mono/Microsoft SDKs/F#/3.1/
/usr/lib/mono/Microsoft SDKs/F#/3.1/Framework/
/usr/lib/mono/Microsoft SDKs/F#/3.1/Framework/v4.0/
/usr/lib/mono/Microsoft SDKs/F#/3.1/Framework/v4.0/Microsoft.FSharp.Targets
/usr/lib/mono/Microsoft SDKs/F#/3.1/Framework/v4.0/Microsoft.Portable.FSharp.Targets
/usr/lib/mono/Microsoft SDKs/F#/3.0/
/usr/lib/mono/Microsoft SDKs/F#/3.0/Framework/
/usr/lib/mono/Microsoft SDKs/F#/3.0/Framework/v4.0/
/usr/lib/mono/Microsoft SDKs/F#/3.0/Framework/v4.0/Microsoft.FSharp.Targets
/usr/lib/mono/Microsoft SDKs/F#/3.0/Framework/v4.0/Microsoft.Portable.FSharp.Targets
/usr/lib/mono/xbuild/
/usr/lib/mono/xbuild/Microsoft/
/usr/lib/mono/xbuild/Microsoft/VisualStudio/
/usr/lib/mono/xbuild/Microsoft/VisualStudio/v11.0/
/usr/lib/mono/xbuild/Microsoft/VisualStudio/v11.0/FSharp/
/usr/lib/mono/xbuild/Microsoft/VisualStudio/v11.0/FSharp/Microsoft.FSharp.Targets
/usr/lib/mono/xbuild/Microsoft/VisualStudio/v11.0/FSharp/Microsoft.Portable.FSharp.Targets
/usr/lib/mono/xbuild/Microsoft/VisualStudio/v12.0/
/usr/lib/mono/xbuild/Microsoft/VisualStudio/v12.0/FSharp/
/usr/lib/mono/xbuild/Microsoft/VisualStudio/v12.0/FSharp/Microsoft.FSharp.Targets
/usr/lib/mono/xbuild/Microsoft/VisualStudio/v12.0/FSharp/Microsoft.Portable.FSharp.Targets
/usr/lib/mono/xbuild/Microsoft/VisualStudio/v/
/usr/lib/mono/xbuild/Microsoft/VisualStudio/v/FSharp/
/usr/lib/mono/xbuild/Microsoft/VisualStudio/v/FSharp/Microsoft.FSharp.Targets
/usr/lib/mono/xbuild/Microsoft/VisualStudio/v/FSharp/Microsoft.Portable.FSharp.Targets
/usr/lib/mono/xbuild/Microsoft/VisualStudio/v14.0/
/usr/lib/mono/xbuild/Microsoft/VisualStudio/v14.0/FSharp/
/usr/lib/mono/xbuild/Microsoft/VisualStudio/v14.0/FSharp/Microsoft.FSharp.Targets
/usr/lib/mono/xbuild/Microsoft/VisualStudio/v14.0/FSharp/Microsoft.Portable.FSharp.Targets
/usr/lib/mono/Microsoft F#/
/usr/lib/mono/Microsoft F#/v4.0/
/usr/lib/mono/Microsoft F#/v4.0/Microsoft.FSharp.Targets
/usr/lib/mono/Microsoft F#/v4.0/Microsoft.Portable.FSharp.Targets