mono fstar.exe error

gistfile1.txt

$ mono fstar.exe 
Missing method get_argv in assembly /Users/dvanhorn/Documents/play/fstar/fstar-0.5-alpha/bin/basic.dll, type Microsoft.FSharp.Compatibility.OCaml.SysModule
Unexpected exception :( 
System.IO.FileNotFoundException: Could not load file or assembly 'FSharp.PowerPack.Compatibility, Version=2.0.0.0, Culture=neutral, PublicKeyToken=a19089b1c74d0809' or one of its dependencies.
File name: 'FSharp.PowerPack.Compatibility, Version=2.0.0.0, Culture=neutral, PublicKeyToken=a19089b1c74d0809'
  at Microsoft.FStar.FStar.process_args () [0x00000] in <filename unknown>:0 
  at Microsoft.FStar.FStar.do_main[Unit] (Microsoft.FSharp.Core.Unit _arg1) [0x00000] in <filename unknown>:0 Missing method flush in assembly /Users/dvanhorn/Documents/play/fstar/fstar-0.5-alpha/bin/fstar.exe, type Microsoft.FSharp.Compatibility.OCaml.PervasivesModule

Unhandled Exception: System.IO.FileNotFoundException: Could not load file or assembly 'FSharp.PowerPack.Compatibility, Version=2.0.0.0, Culture=neutral, PublicKeyToken=a19089b1c74d0809' or one of its dependencies.
File name: 'FSharp.PowerPack.Compatibility, Version=2.0.0.0, Culture=neutral, PublicKeyToken=a19089b1c74d0809'
  at <StartupCode$fstar>.$Microsoft.FStar.Wrapper.main@ () [0x00000] in <filename unknown>:0


$ mono --version
Mono JIT compiler version 2.10.1 (tarball Fri Feb 25 15:56:49 MST 2011)
Copyright (C) 2002-2011 Novell, Inc and Contributors. www.mono-project.com
	TLS:           normal
	SIGSEGV:       normal
	Notification:  Thread + polling
	Architecture:  x86
	Disabled:      none
	Misc:          debugger softdebug 
	LLVM:          yes(2.9svn-mono)
	GC:            Included Boehm (with typed GC)

$ uname -a
Darwin doom.local 12.0.0 Darwin Kernel Version 12.0.0: Sun Jun 24 23:00:16 PDT 2012; root:xnu-2050.7.9~1/RELEASE_X86_64 x86_64