Debian patches are maintained in Git: see Vcs-Git in debian/control.
--- dbus-sharp-0.8.1.orig/src/Unix/UnixSocket.cs
+++ dbus-sharp-0.8.1/src/Unix/UnixSocket.cs
@@ -48,7 +48,7 @@ namespace DBus.Unix
 
 		public const short AF_UNIX = 1;
 		// FIXME: SOCK_STREAM is 2 on Solaris
-		public const short SOCK_STREAM = 1;
+		public const short SOCK_STREAM = 2;
 
 		[DllImport (LIBC, CallingConvention = CallingConvention.Cdecl, SetLastError = true)]
 		internal static extern IntPtr fork ();
