diff -ru lv451-orig/lv.1 lv451/lv.1
--- lv451-orig/lv.1	2004-01-16 21:23:33.000000000 +0900
+++ lv451/lv.1	2007-01-21 18:03:59.392625000 +0900
@@ -213,6 +213,8 @@
 Prefix each line of output with the line number within its input file on lgrep.
 .IP "-v"
 Invert the sense of matching on lgrep.
+.IP "-x<\fInumber\fP>"
+Set the tab width. (Default: 8)
 .IP "-z"
 Enable HZ auto-detection (also enabled by run-time C-t).
 .br
diff -ru lv451-orig/lv.hlp lv451/lv.hlp
--- lv451-orig/lv.hlp	2004-01-16 21:24:09.000000000 +0900
+++ lv451/lv.hlp	2007-01-21 18:03:59.611375000 +0900
@@ -218,6 +218,9 @@
 
        -v     Invert the sense of matching on lgrep.
 
+       -x<_n_u_m_b_e_r>
+              Set the tab width. (Default: 8)
+
        -z     Enable  HZ auto-detection (also enabled by run-time
               C-t).
 
diff -ru lv451-orig/src/conf.c lv451/src/conf.c
--- lv451-orig/src/conf.c	2004-01-05 16:23:29.000000000 +0900
+++ lv451/src/conf.c	2007-01-21 18:06:24.877000000 +0900
@@ -70,6 +70,8 @@
 #define LV_HELP		"lv.hlp"
 /*#define LV_HELP_PATH	"/usr/local/lib/lv/"*/ /* now defined through make */
 
+public int g_htab_width = 8;
+
 private byte *lvHelpFile[ 2 ];
 
 private void ConfInitArgs( conf_t *conf )
@@ -276,6 +278,13 @@
 	  strcpy( editor_program, s + 1 );
 	}
 	break;
+      case 'x':
+	g_htab_width = atoi( s + 1 );
+	if ( g_htab_width < 1 || 8 < g_htab_width ) {
+	  fprintf( stderr, "lv: wrong tab width %s in %s\n", s + 1, location );
+	  exit( -1 );
+	}
+	  break;
 #ifndef MSDOS /* IF NOT DEFINED */
       case 'T': unicode_width_threshold = (ic_t)atoi( s + 1 ); break;
       case 'm': unimap_iso8859 = TRUE; s++; continue;
diff -ru lv451-orig/src/ichar.h lv451/src/ichar.h
--- lv451-orig/src/ichar.h	2003-11-13 12:08:19.000000000 +0900
+++ lv451/src/ichar.h	2007-01-21 18:06:42.064500000 +0900
@@ -20,7 +20,8 @@
 #define CNTRLWIDTH_MIDDLEFORM	2	/* 0x20 .. 0x7e */
 #define CNTRLWIDTH_LONGFORM	4	/* 0x7f .. 0xff */
 
-#define HTAB_WIDTH		8
+public int g_htab_width;
+#define HTAB_WIDTH		(g_htab_width)
 #define HTAB_INTERNAL_WIDTH	2
 
 #define MakeByte1( ic )		( (byte)( (ic) >> 8 ) )