diff --git a/runtime/syntax/c.vim b/runtime/syntax/c.vim
index 07df36b..9456212 100644
--- a/runtime/syntax/c.vim
+++ b/runtime/syntax/c.vim
@@ -1,7 +1,7 @@
 " Vim syntax file
 " Language:	C
 " Maintainer:	Bram Moolenaar <Bram@vim.org>
-" Last Change:	2008 Mar 19
+" Last Change:	2009 Nov 17
 
 " Quit when a (custom) syntax file was already loaded
 if exists("b:current_syntax")
@@ -16,8 +16,13 @@
 
 syn keyword	cTodo		contained TODO FIXME XXX
 
+" It's easy to accidentally add a space after a backslash that was intended
+" for line continuation.  Some compilers allow it, which makes it
+" unpredicatable and should be avoided.
+syn match	cBadContinuation contained "\\\s\+$"
+
 " cCommentGroup allows adding matches for special things in comments
-syn cluster	cCommentGroup	contains=cTodo
+syn cluster	cCommentGroup	contains=cTodo,cBadContinuation
 
 " String and Character constants
 " Highlight special characters (those which have a backslash) differently
@@ -265,7 +270,7 @@
 endif
 
 " Accept %: for # (C99)
-syn region	cPreCondit	start="^\s*\(%:\|#\)\s*\(if\|ifdef\|ifndef\|elif\)\>" skip="\\$" end="$" end="//"me=s-1 contains=cComment,cCppString,cCharacter,cCppParen,cParenError,cNumbers,cCommentError,cSpaceError
+syn region	cPreCondit	start="^\s*\(%:\|#\)\s*\(if\|ifdef\|ifndef\|elif\)\>" skip="\\$" end="$"  contains=cComment,cCommentL,cCppString,cCharacter,cCppParen,cParenError,cNumbers,cCommentError,cSpaceError
 syn match	cPreCondit	display "^\s*\(%:\|#\)\s*\(else\|endif\)\>"
 if !exists("c_no_if0")
   if !exists("c_no_if0_fold")
@@ -281,7 +286,7 @@
 syn match	cInclude	display "^\s*\(%:\|#\)\s*include\>\s*["<]" contains=cIncluded
 "syn match cLineSkip	"\\$"
 syn cluster	cPreProcGroup	contains=cPreCondit,cIncluded,cInclude,cDefine,cErrInParen,cErrInBracket,cUserLabel,cSpecial,cOctalZero,cCppOut,cCppOut2,cCppSkip,cFormat,cNumber,cFloat,cOctal,cOctalError,cNumbersCom,cString,cCommentSkip,cCommentString,cComment2String,@cCommentGroup,cCommentStartError,cParen,cBracket,cMulti
-syn region	cDefine		start="^\s*\(%:\|#\)\s*\(define\|undef\)\>" skip="\\$" end="$" end="//"me=s-1 keepend contains=ALLBUT,@cPreProcGroup,@Spell
+syn region	cDefine		start="^\s*\(%:\|#\)\s*\(define\|undef\)\>" skip="\\$" end="$" keepend contains=ALLBUT,@cPreProcGroup,@Spell
 syn region	cPreProc	start="^\s*\(%:\|#\)\s*\(pragma\>\|line\>\|warning\>\|warn\>\|error\>\)" skip="\\$" end="$" keepend contains=ALLBUT,@cPreProcGroup,@Spell
 
 " Highlight User Labels
@@ -359,6 +364,7 @@
 hi def link cComment		Comment
 hi def link cSpecial		SpecialChar
 hi def link cTodo		Todo
+hi def link cBadContinuation	Error
 hi def link cCppSkip		cCppOut
 hi def link cCppOut2		cCppOut
 hi def link cCppOut		Comment