+* `--with-csc=roslyn,mcs,default`
+
+ * Use this option to configure which C# compiler to use. By default
+ the configure script will pick Roslyn, except on platforms where
+ Roslyn does not work (Big Endian systems) where it will pick mcs.
+
+ If you specify "mcs", then Mono's C# compiler will be used. This
+ also allows for a complete bootstrap of Mono's core compiler and
+ core libraries from source.
+
+ If you specify "roslyn", then Roslyn's C# compiler will be used.
+ This currently uses Roslyn binaries.
+