-#AC_ARG_WITH(profile2, [ --with-profile2=yes,no If you want to install the 2.0 FX (defaults to yes)], [], [with_profile2=yes])
-AC_ARG_WITH(profile4, [ --with-profile4=yes,no If you want to install the 4.x FX (defaults to yes)], [], [with_profile4=yes])
-AC_ARG_WITH(monodroid, [ --with-monodroid=yes,no If you want to build the MonoDroid 2.1 assemblies (defaults to no)], [], [with_monodroid=no])
-AC_ARG_WITH(monotouch, [ --with-monotouch=yes,no If you want to build the MonoTouch 2.1 assemblies (defaults to no)], [], [with_monotouch=no])
-AC_ARG_WITH(mobile, [ --with-mobile=yes,no If you want to build the Mobile 2.1 assemblies (defaults to no)], [], [with_mobile=no])
+AC_ARG_WITH(profile2, [ --with-profile2=yes,no If you want to install the 2.0/3.5 FX (defaults to yes)], [], [with_profile2=yes])
+AC_ARG_WITH(profile4, [ --with-profile4=yes,no If you want to install the 4.0 FX (defaults to yes)], [], [with_profile4=yes])
+AC_ARG_WITH(profile4_5,[ --with-profile4_5=yes,no If you want to install the 4.5 FX (defaults to yes)], [], [with_profile4_5=yes])
+AC_ARG_WITH(monodroid, [ --with-monodroid=yes,no If you want to build the MonoDroid assemblies (defaults to no)], [], [with_monodroid=no])
+AC_ARG_WITH(monotouch, [ --with-monotouch=yes,no If you want to build the MonoTouch assemblies (defaults to no)], [], [with_monotouch=no])
+AC_ARG_WITH(mobile, [ --with-mobile=yes,no If you want to build the Mobile assemblies (defaults to no)], [], [with_mobile=no])