new file mode 100644
--- /dev/null
+++ b/runtime/syntax/m4.vim
@@ -0,0 +1,73 @@
+" Vim syntax file
+" Language:		M4
+" Maintainer:	Claudio Fleiner
+" URL:			http://www.fleiner.com/vim/syntax/m4.vim
+" Last Change:	2001 Apr 26
+
+" This file will highlight user function calls if they use only
+" capital letters and have at least one argument (i.e. the '('
+" must be there). Let me know if this is a problem.
+
+" For version 5.x: Clear all syntax items
+" For version 6.x: Quit when a syntax file was already loaded
+if !exists("main_syntax")
+  if version < 600
+    syntax clear
+  elseif exists("b:current_syntax")
+  finish
+endif
+" we define it here so that included files can test for it
+  let main_syntax='m4'
+endif
+
+" define the m4 syntax
+syn match  m4Variable contained "\$\d\+"
+syn match  m4Special  contained "$[@*#]"
+syn match  m4Comment  "dnl\>.*" contains=SpellErrors
+syn match  m4Constants "\(\<m4_\)\=__file__"
+syn match  m4Constants "\(\<m4_\)\=__line__"
+syn keyword m4Constants divnum sysval m4_divnum m4_sysval
+syn region m4Paren    matchgroup=m4Delimiter start="(" end=")" contained contains=@m4Top
+syn region m4Command  matchgroup=m4Function  start="\<\(m4_\)\=\(define\|defn\|pushdef\)(" end=")" contains=@m4Top
+syn region m4Command  matchgroup=m4Preproc   start="\<\(m4_\)\=\(include\|sinclude\)("he=e-1 end=")" contains=@m4Top
+syn region m4Command  matchgroup=m4Statement start="\<\(m4_\)\=\(syscmd\|esyscmd\|ifdef\|ifelse\|indir\|builtin\|shift\|errprint\|m4exit\|changecom\|changequote\|changeword\|m4wrap\|debugfile\|divert\|undivert\)("he=e-1 end=")" contains=@m4Top
+syn region m4Command  matchgroup=m4builtin start="\<\(m4_\)\=\(len\|index\|regexp\|substr\|translit\|patsubst\|format\|incr\|decr\|eval\|maketemp\)("he=e-1 end=")" contains=@m4Top
+syn keyword m4Statement divert undivert
+syn region m4Command  matchgroup=m4Type      start="\<\(m4_\)\=\(undefine\|popdef\)("he=e-1 end=")" contains=@m4Top
+syn region m4Function matchgroup=m4Type      start="\<[_A-Z][_A-Z0-9]*("he=e-1 end=")" contains=@m4Top
+syn region m4String   start="`" end="'" contained contains=@m4Top,@m4StringContents,SpellErrors
+syn cluster m4Top     contains=m4Comment,m4Constants,m4Special,m4Variable,m4String,m4Paren,m4Command,m4Statement,m4Function
+
+" Define the default highlighting.
+" For version 5.7 and earlier: only when not done already
+" For version 5.8 and later: only when an item doesn't have highlighting yet
+if version >= 508 || !exists("did_m4_syn_inits")
+  if version < 508
+    let did_m4_syn_inits = 1
+    command -nargs=+ HiLink hi link <args>
+  else
+    command -nargs=+ HiLink hi def link <args>
+  endif
+  HiLink m4Delimiter Delimiter
+  HiLink m4Comment   Comment
+  HiLink m4Function  Function
+  HiLink m4Keyword   Keyword
+  HiLink m4Special   Special
+  HiLink m4String    String
+  HiLink m4Statement Statement
+  HiLink m4Preproc   PreProc
+  HiLink m4Type      Type
+  HiLink m4Special   Special
+  HiLink m4Variable  Special
+  HiLink m4Constants Constant
+  HiLink m4Builtin   Statement
+  delcommand HiLink
+endif
+
+let b:current_syntax = "m4"
+
+if main_syntax == 'm4'
+  unlet main_syntax
+endif
+
+" vim: ts=4