getnaifspicetoolkit.py, KeyError: 'X86_64' on Mac (10.9) x86_64

[gorticus]

On a Mac OS 10.9:

$ uname -a
Darwin gothmog.maiar.lan 13.0.2 Darwin Kernel Version 13.0.2: Sun Sep 29 19:38:57 PDT 2013; root:xnu-2422.75.4~1/RELEASE_X86_64 x86_64

Running getnaifspicetoolkit.py produces

$ ./getnaifspicetoolkit.py
Traceback (most recent call last):
  File "./getnaifspicetoolkit.py", line 278, in <module>
    main(sys.argv[1:])
  File "./getnaifspicetoolkit.py", line 206, in main
    nstkurl = getnstkurl(force=testOption,log=True)
  File "./getnaifspicetoolkit.py", line 159, in getnstkurl
    subdir='_'.join([ dSys1[opsys][machine], dSys1[opsys]['sis2'], compiler, unbit ])
KeyError: 'X86_64'

This patch seems to correct it.

--- a/getnaifspicetoolkit.py
+++ b/getnaifspicetoolkit.py
@@ -100,7 +100,7 @@ Index of http://naif.jpl.nasa.gov/pub/naif/toolkit/C/:
   ###   SUNOS and SUN4U => SunSPARC_Solaris
   ###

-  dSys1 = dict( OSX=dict( I386='MacIntel', PPC='MacPPC', sis2='OSX', zSfx='tar.Z' )
+  dSys1 = dict( OSX=dict( I386='MacIntel', X86_64='MacIntel', PPC='MacPPC', sis2='OSX', zSfx='tar.Z' )
               , LINUX=dict( I386='PC', X86_64='PC', sis2='Linux', zSfx='tar.Z' )
               , CYGWIN=dict( I386='PC', X86_64='PC', sis2='Cygwin', zSfx='tar.Z' )
               , WINDOWS=dict( I386='PC', X86_64='PC', sis2='Windows', zSfx='zip' )