--- a/src/vim.h
+++ b/src/vim.h
@@ -853,6 +853,27 @@ extern char *(*dyn_libintl_textdomain)(c
 # endif
 # define SST_FIX_STATES	 7	/* size of sst_stack[]. */
 # define SST_DIST	 16	/* normal distance between entries */
+# define SST_INVALID	(synstate_T *)-1	/* invalid syn_state pointer */
+
+# define HL_CONTAINED	0x01	/* not used on toplevel */
+# define HL_TRANSP	0x02	/* has no highlighting	*/
+# define HL_ONELINE	0x04	/* match within one line only */
+# define HL_HAS_EOL	0x08	/* end pattern that matches with $ */
+# define HL_SYNC_HERE	0x10	/* sync point after this item (syncing only) */
+# define HL_SYNC_THERE	0x20	/* sync point at current line (syncing only) */
+# define HL_MATCH	0x40	/* use match ID instead of item ID */
+# define HL_SKIPNL	0x80	/* nextgroup can skip newlines */
+# define HL_SKIPWHITE	0x100	/* nextgroup can skip white space */
+# define HL_SKIPEMPTY	0x200	/* nextgroup can skip empty lines */
+# define HL_KEEPEND	0x400	/* end match always kept */
+# define HL_EXCLUDENL	0x800	/* exclude NL from match */
+# define HL_DISPLAY	0x1000	/* only used for displaying, not syncing */
+# define HL_FOLD	0x2000	/* define fold */
+# define HL_EXTEND	0x4000	/* ignore a keepend */
+# define HL_MATCHCONT	0x8000	/* match continued from previous line */
+# define HL_TRANS_CONT	0x10000 /* transparent item without contains arg */
+# define HL_CONCEAL	0x20000 /* can be concealed */
+# define HL_CONCEALENDS	0x40000 /* can be concealed */
 #endif
 
 /* Values for 'options' argument in do_search() and searchit() */
@@ -1292,6 +1313,7 @@ typedef enum
     , HLF_CHD	    /* Changed diff line */
     , HLF_DED	    /* Deleted diff line */
     , HLF_TXD	    /* Text Changed in diff line */
+    , HLF_CONCEAL   /* Concealed text */
     , HLF_SC	    /* Sign column */
     , HLF_SPB	    /* SpellBad */
     , HLF_SPC	    /* SpellCap */
@@ -1313,7 +1335,7 @@ typedef enum
  * When changing this also adjust the default for 'highlight'. */
 #define HL_FLAGS {'8', '@', 'd', 'e', 'h', 'i', 'l', 'm', 'M', \
 		  'n', 'r', 's', 'S', 'c', 't', 'v', 'V', 'w', 'W', \
-		  'f', 'F', 'A', 'C', 'D', 'T', '>', \
+		  'f', 'F', 'A', 'C', 'D', 'T', '-', '>', \
 		  'B', 'P', 'R', 'L', \
 		  '+', '=', 'x', 'X', '*', '#', '_', '!', '.'}