RenderMan SL comments syntax

Hi all.
I have seen that the syntax for renderman shading language doesn't support comments ala c++, that is said using // .
In the sl.vim for the syntax that comes with vim seems that there is a variable that will enable, I think this is the code used in sl.vim to define the comments:

if exists("sl_comment_strings")
  " A comment can contain slString, slCharacter and slNumber.
  " But a "*/" inside a slString in a slComment DOES end the comment!  So we
  " need to use a special type of slString: slCommentString, which also ends on
   " "*/", and sees a "*" at the start of the line as comment again.
  " Unfortunately this doesn't very well work for // type of comments :-(
  syntax match slCommentSkip	contained "^\s*\*\($\|\s\+\)"
   syntax region slCommentString	contained start=+"+ skip=+\\\\\|\\"+ end=+"+ end=+\*/+me=s-1 contains=slSpecial,slCommentSkip
  syntax region slComment2String	contained start=+"+ skip=+\\\\\|\\"+ end=+"+ end="$" contains=slSpecial
   syntax region slComment	start="/\*" end="\*/" contains=slTodo,slCommentString,slCharacter,slNumber
else
  syn region slComment		start="/\*" end="\*/" contains=slTodo
endif
 syntax match slCommentError	"\*/"

syn keyword slOperator	sizeof
syn keyword slType		float point color string vector normal matrix void
syn keyword slStorageClass	varying uniform extern
syn keyword slStorageClass	light surface volume displacement transformation imager
 syn keyword slVariable	Cs Os P dPdu dPdv N Ng u v du dv s t
syn keyword slVariable L Cl Ol E I ncomps time Ci Oi
syn keyword slVariable Ps alpha
syn keyword slVariable dtime dPdtime

syn sync ccomment slComment minlines=10
 

I have use:
let sl_comment_strings = 1
To try to enable it, but not working.
Somebody with a similar issue???
Thanks

--
Un saludo
Best Regards
Pablo Giménez

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