Index: texvc.ml
===================================================================
--- texvc.ml	(revision 64567)
+++ texvc.ml	(working copy)
@@ -1,4 +1,13 @@
 exception LexerException of string
+
+(* Updates the output_hash with any version requirements *)
+let output_hash md5 =
+    let version = !Texutil.version_needed in
+    if version > "" then 
+        Digest.to_hex (Digest.string md5 ^ version )
+    else
+        md5
+
 let lexer_token_safe lexbuf =
     try Lexer.token lexbuf
     with Failure s -> raise (LexerException s)
@@ -19,7 +28,7 @@
 	  | Some h,Html.LIBERAL,Some m -> "L" ^ md5 ^ h ^ "\000" ^ m
 	  | None,_,Some m -> "X" ^ md5   ^ m
 	);
-	Render.render tmppath finalpath outtex md5 backcolor
+	Render.render tmppath finalpath outtex (output_hash md5) backcolor
     end
 let _ =
     Texutil.set_encoding (try Sys.argv.(4) with _ -> "UTF-8");
Index: texutil.ml
===================================================================
--- texutil.ml	(revision 64567)
+++ texutil.ml	(working copy)
@@ -34,6 +34,9 @@
   | TEX_MATRIX (t,rows) -> "{\\begin{"^t^"}"^(mapjoine "\\\\" (mapjoine "&" (mapjoin render_tex)) rows)^"\\end{"^t^"}}"
   | TEX_LR (l,r,tl) -> "\\left "^(tex_part l)^(mapjoin render_tex tl)^"\\right "^(tex_part r)
 
+let version_needed = ref ""
+let changed_on version = ( if !version_needed < version then version_needed := version else () )
+let get_version_needed = !version_needed
 
 (* Dynamic loading*)
 type encoding_t = LATIN1 | LATIN2 | UTF8
@@ -128,7 +131,7 @@
     "\\mathrm{T}", "&Tau;")))
     | "\\upsilon"          -> LITERAL (HTMLABLEC (FONT_UF,  "\\upsilon ", "&upsilon;"))
     | "\\Upsilon"          -> LITERAL (HTMLABLEC (FONT_UF, "\\Upsilon ", "&Upsilon;"))
-    | "\\phi"              -> LITERAL (HTMLABLEC (FONT_UF,  "\\phi ", "&phi;"))
+    | "\\phi"              -> (changed_on("2010-04-03"); LITERAL (TEX_ONLY "\\phi "))
     | "\\Phi"              -> LITERAL (HTMLABLEC (FONT_UF, "\\Phi ", "&Phi;"))
     | "\\varphi"           -> LITERAL (TEX_ONLY "\\varphi ")
     | "\\chi"              -> LITERAL (HTMLABLEC (FONT_UF,  "\\chi ", "&chi;"))
Index: texutil.mli
===================================================================
--- texutil.mli	(revision 64567)
+++ texutil.mli	(working copy)
@@ -6,6 +6,7 @@
 
 val get_preface : unit -> string
 val get_footer : unit -> string
+val version_needed : string ref
 
 exception Illegal_tex_function of string
 val find: string -> Parser.token