new file mode 100644
--- /dev/null
+++ b/runtime/syntax/ayacc.vim
@@ -0,0 +1,86 @@
+" Vim syntax file
+" Language:	AYacc
+" Maintainer:	Mathieu Clabaut <mathieu.clabaut@free.fr>
+" LastChange:	02 May 2001
+" Original:	Yacc, maintained by Dr. Charles E. Campbell, Jr.
+" Comment:	     Replaced sourcing c.vim file by ada.vim and rename yacc*
+"		in ayacc*
+
+" For version 5.x: Clear all syntax items
+" For version 6.x: Quit when a syntax file was already loaded
+if version < 600
+   syntax clear
+elseif exists("b:current_syntax")
+   finish
+endif
+
+" Read the Ada syntax to start with
+if version < 600
+   so <sfile>:p:h/ada.vim
+else
+   runtime! syntax/ada.vim
+   unlet b:current_syntax
+endif
+
+" Clusters
+syn cluster	ayaccActionGroup	contains=ayaccDelim,cInParen,cTodo,cIncluded,ayaccDelim,ayaccCurlyError,ayaccUnionCurly,ayaccUnion,cUserLabel,cOctalZero,cCppOut2,cCppSkip,cErrInBracket,cErrInParen,cOctalError
+syn cluster	ayaccUnionGroup	contains=ayaccKey,cComment,ayaccCurly,cType,cStructure,cStorageClass,ayaccUnionCurly
+
+" Yacc stuff
+syn match	ayaccDelim	"^[ \t]*[:|;]"
+syn match	ayaccOper	"@\d\+"
+
+syn match	ayaccKey	"^[ \t]*%\(token\|type\|left\|right\|start\|ident\)\>"
+syn match	ayaccKey	"[ \t]%\(prec\|expect\|nonassoc\)\>"
+syn match	ayaccKey	"\$\(<[a-zA-Z_][a-zA-Z_0-9]*>\)\=[\$0-9]\+"
+syn keyword	ayaccKeyActn	yyerrok yyclearin
+
+syn match	ayaccUnionStart	"^%union"	skipwhite skipnl nextgroup=ayaccUnion
+syn region	ayaccUnion	contained matchgroup=ayaccCurly start="{" matchgroup=ayaccCurly end="}"	contains=@ayaccUnionGroup
+syn region	ayaccUnionCurly	contained matchgroup=ayaccCurly start="{" matchgroup=ayaccCurly end="}" contains=@ayaccUnionGroup
+syn match	ayaccBrkt	contained "[<>]"
+syn match	ayaccType	"<[a-zA-Z_][a-zA-Z0-9_]*>"	contains=ayaccBrkt
+syn match	ayaccDefinition	"^[A-Za-z][A-Za-z0-9_]*[ \t]*:"
+
+" special Yacc separators
+syn match	ayaccSectionSep	"^[ \t]*%%"
+syn match	ayaccSep	"^[ \t]*%{"
+syn match	ayaccSep	"^[ \t]*%}"
+
+" I'd really like to highlight just the outer {}.  Any suggestions???
+syn match	ayaccCurlyError	"[{}]"
+syn region	ayaccAction	matchgroup=ayaccCurly start="{" end="}" contains=ALLBUT,@ayaccActionGroup
+
+if version >= 508 || !exists("did_ayacc_syntax_inits")
+   if version < 508
+      let did_ayacc_syntax_inits = 1
+      command -nargs=+ HiLink hi link <args>
+   else
+      command -nargs=+ HiLink hi def link <args>
+   endif
+
+  " Internal ayacc highlighting links
+  HiLink ayaccBrkt	ayaccStmt
+  HiLink ayaccKey	ayaccStmt
+  HiLink ayaccOper	ayaccStmt
+  HiLink ayaccUnionStart	ayaccKey
+
+  " External ayacc highlighting links
+  HiLink ayaccCurly	Delimiter
+  HiLink ayaccCurlyError	Error
+  HiLink ayaccDefinition	Function
+  HiLink ayaccDelim	Function
+  HiLink ayaccKeyActn	Special
+  HiLink ayaccSectionSep	Todo
+  HiLink ayaccSep	Delimiter
+  HiLink ayaccStmt	Statement
+  HiLink ayaccType	Type
+
+  " since Bram doesn't like my Delimiter :|
+  HiLink Delimiter	Type
+  delcommand HiLink
+endif
+
+let b:current_syntax = "ayacc"
+
+" vim: ts=15