--- a/runtime/syntax/config.vim
+++ b/runtime/syntax/config.vim
@@ -1,11 +1,13 @@
 " Vim syntax file
 " Language:		configure.in script: M4 with sh
 " Maintainer:	Christian Hammesr <ch@lathspell.westend.com>
-" Last Change:	2008 Sep 03
+" Last Change:	2015 Jan 14
+" 				(patch from Yngve Inntjore Levinsen to detect AC_MSG)
+" 				(patch from Khym Chanur to add @Spell)
 
 " Well, I actually even do not know much about m4. This explains why there
 " is probably very much missing here, yet !
-" But I missed a good hilighting when editing my GNU autoconf/automake
+" But I missed good highlighting when editing my GNU autoconf/automake
 " script, so I wrote this quick and dirty patch.
 
 
@@ -20,14 +22,19 @@ endif
 " define the config syntax
 syn match   configdelimiter "[()\[\];,]"
 syn match   configoperator  "[=|&\*\+\<\>]"
-syn match   configcomment   "\(dnl.*\)\|\(#.*\)"
+syn match   configcomment   "\(dnl.*\)\|\(#.*\)" contains=configDnl,@Spell
 syn match   configfunction  "\<[A-Z_][A-Z0-9_]*\>"
 syn match   confignumber    "[-+]\=\<\d\+\(\.\d*\)\=\>"
+syn keyword configDnl   	dnl contained
 syn keyword configkeyword   if then else fi test for in do done
 syn keyword configspecial   cat rm eval
-syn region  configstring    start=+"+ skip=+\\"+ end=+"+
-syn region  configstring    start=+'+ skip=+\\'+ end=+'+
-syn region  configstring    start=+`+ skip=+\\'+ end=+`+
+
+" This shortens the script, see syn-ext-match..
+syn region  configstring    start=+\z(["'`]\)+ skip=+\\\z1+ end=+\z1+ contains=@Spell
+
+" Anything inside AC_MSG_TYPE([...])  and AC_MSG_TYPE(...) is a string.
+syn region  configstring matchgroup=configfunction start="AC_MSG_[A-Z]*\ze(\[" matchgroup=configdelimiter end="\])" contains=configdelimiter,@Spell
+syn region  configstring matchgroup=configfunction start="AC_MSG_[A-Z]*\ze([^[]" matchgroup=configdelimiter end=")" contains=configdelimiter,@Spell
 
 " Define the default highlighting.
 " For version 5.7 and earlier: only when not done already
@@ -43,6 +50,7 @@ if version >= 508 || !exists("did_config
   HiLink configdelimiter Delimiter
   HiLink configoperator  Operator
   HiLink configcomment   Comment
+  HiLink configDnl  	 Comment
   HiLink configfunction  Function
   HiLink confignumber    Number
   HiLink configkeyword   Keyword