--- a/src/option.c
+++ b/src/option.c
@@ -66,9 +66,7 @@
 #endif
 #define PV_BIN		OPT_BUF(BV_BIN)
 #define PV_BL		OPT_BUF(BV_BL)
-#ifdef FEAT_MBYTE
-# define PV_BOMB	OPT_BUF(BV_BOMB)
-#endif
+#define PV_BOMB		OPT_BUF(BV_BOMB)
 #define PV_CI		OPT_BUF(BV_CI)
 #ifdef FEAT_CINDENT
 # define PV_CIN		OPT_BUF(BV_CIN)
@@ -101,9 +99,7 @@
 #define PV_FIXEOL	OPT_BUF(BV_FIXEOL)
 #define PV_EP		OPT_BOTH(OPT_BUF(BV_EP))
 #define PV_ET		OPT_BUF(BV_ET)
-#ifdef FEAT_MBYTE
-# define PV_FENC	OPT_BUF(BV_FENC)
-#endif
+#define PV_FENC		OPT_BUF(BV_FENC)
 #if defined(FEAT_BEVAL) && defined(FEAT_EVAL)
 # define PV_BEXPR	OPT_BOTH(OPT_BUF(BV_BEXPR))
 #endif
@@ -137,9 +133,7 @@
 # define PV_LISP	OPT_BUF(BV_LISP)
 # define PV_LW		OPT_BOTH(OPT_BUF(BV_LW))
 #endif
-#ifdef FEAT_MBYTE
-# define PV_MENC	OPT_BOTH(OPT_BUF(BV_MENC))
-#endif
+#define PV_MENC		OPT_BOTH(OPT_BUF(BV_MENC))
 #define PV_MA		OPT_BUF(BV_MA)
 #define PV_ML		OPT_BUF(BV_ML)
 #define PV_MOD		OPT_BUF(BV_MOD)
@@ -281,9 +275,7 @@ typedef enum
  */
 static int	p_ai;
 static int	p_bin;
-#ifdef FEAT_MBYTE
 static int	p_bomb;
-#endif
 static char_u	*p_bh;
 static char_u	*p_bt;
 static int	p_bl;
@@ -312,9 +304,7 @@ static char_u	*p_ofu;
 static int	p_eol;
 static int	p_fixeol;
 static int	p_et;
-#ifdef FEAT_MBYTE
 static char_u	*p_fenc;
-#endif
 static char_u	*p_ff;
 static char_u	*p_fo;
 static char_u	*p_flp;
@@ -554,13 +544,8 @@ static struct vimoption options[] =
 #endif
 			    {(char_u *)FALSE, (char_u *)0L} SCTX_INIT},
     {"ambiwidth",  "ambw",  P_STRING|P_VI_DEF|P_RCLR,
-#if defined(FEAT_MBYTE)
 			    (char_u *)&p_ambw, PV_NONE,
 			    {(char_u *)"single", (char_u *)0L}
-#else
-			    (char_u *)NULL, PV_NONE,
-			    {(char_u *)0L, (char_u *)0L}
-#endif
 			    SCTX_INIT},
     {"autochdir",  "acd",   P_BOOL|P_VI_DEF,
 #ifdef FEAT_AUTOCHDIR
@@ -680,11 +665,7 @@ static struct vimoption options[] =
 			    (char_u *)NULL, PV_NONE,
 			    {(char_u *)TRUE, (char_u *)0L} SCTX_INIT},
     {"bomb",	    NULL,   P_BOOL|P_NO_MKRC|P_VI_DEF|P_RSTAT,
-#ifdef FEAT_MBYTE
 			    (char_u *)&p_bomb, PV_BOMB,
-#else
-			    (char_u *)NULL, PV_NONE,
-#endif
 			    {(char_u *)FALSE, (char_u *)0L} SCTX_INIT},
     {"breakat",	    "brk",  P_STRING|P_VI_DEF|P_RALL|P_FLAGLIST,
 #ifdef FEAT_LINEBREAK
@@ -736,13 +717,8 @@ static struct vimoption options[] =
 			    {(char_u *)"", (char_u *)0L}
 			    SCTX_INIT},
     {"casemap",	    "cmp",   P_STRING|P_VI_DEF|P_ONECOMMA|P_NODUP,
-#ifdef FEAT_MBYTE
 			    (char_u *)&p_cmp, PV_NONE,
 			    {(char_u *)"internal,keepascii", (char_u *)0L}
-#else
-			    (char_u *)NULL, PV_NONE,
-			    {(char_u *)0L, (char_u *)0L}
-#endif
 			    SCTX_INIT},
     {"cdpath",	    "cd",   P_STRING|P_EXPAND|P_VI_DEF|P_COMMA|P_NODUP,
 #ifdef FEAT_SEARCHPATH
@@ -763,7 +739,7 @@ static struct vimoption options[] =
 #endif
 			    SCTX_INIT},
     {"charconvert",  "ccv", P_STRING|P_VI_DEF|P_SECURE,
-#if defined(FEAT_MBYTE) && defined(FEAT_EVAL)
+#if defined(FEAT_EVAL)
 			    (char_u *)&p_ccv, PV_NONE,
 			    {(char_u *)"", (char_u *)0L}
 #else
@@ -1016,11 +992,7 @@ static struct vimoption options[] =
 #endif
 			    SCTX_INIT},
     {"delcombine", "deco",  P_BOOL|P_VI_DEF|P_VIM,
-#ifdef FEAT_MBYTE
 			    (char_u *)&p_deco, PV_NONE,
-#else
-			    (char_u *)NULL, PV_NONE,
-#endif
 			    {(char_u *)FALSE, (char_u *)0L} SCTX_INIT},
     {"dictionary",  "dict", P_STRING|P_EXPAND|P_VI_DEF|P_ONECOMMA|P_NODUP|P_NDNAME,
 #ifdef FEAT_INS_EXPAND
@@ -1077,22 +1049,12 @@ static struct vimoption options[] =
 			    (char_u *)&p_ed, PV_NONE,
 			    {(char_u *)FALSE, (char_u *)0L} SCTX_INIT},
     {"emoji",  "emo",	    P_BOOL|P_VI_DEF|P_RCLR,
-#if defined(FEAT_MBYTE)
 			    (char_u *)&p_emoji, PV_NONE,
 			    {(char_u *)TRUE, (char_u *)0L}
-#else
-			    (char_u *)NULL, PV_NONE,
-			    {(char_u *)0L, (char_u *)0L}
-#endif
 			    SCTX_INIT},
     {"encoding",    "enc",  P_STRING|P_VI_DEF|P_RCLR|P_NO_ML,
-#ifdef FEAT_MBYTE
 			    (char_u *)&p_enc, PV_NONE,
 			    {(char_u *)ENC_DFLT, (char_u *)0L}
-#else
-			    (char_u *)NULL, PV_NONE,
-			    {(char_u *)0L, (char_u *)0L}
-#endif
 			    SCTX_INIT},
     {"endofline",   "eol",  P_BOOL|P_NO_MKRC|P_VI_DEF|P_RSTAT,
 			    (char_u *)&p_eol, PV_EOL,
@@ -1138,22 +1100,12 @@ static struct vimoption options[] =
 			    {(char_u *)FALSE, (char_u *)0L} SCTX_INIT},
     {"fileencoding","fenc", P_STRING|P_ALLOCED|P_VI_DEF|P_RSTAT|P_RBUF
 								   |P_NO_MKRC,
-#ifdef FEAT_MBYTE
 			    (char_u *)&p_fenc, PV_FENC,
 			    {(char_u *)"", (char_u *)0L}
-#else
-			    (char_u *)NULL, PV_NONE,
-			    {(char_u *)0L, (char_u *)0L}
-#endif
 			    SCTX_INIT},
     {"fileencodings","fencs", P_STRING|P_VI_DEF|P_ONECOMMA,
-#ifdef FEAT_MBYTE
 			    (char_u *)&p_fencs, PV_NONE,
 			    {(char_u *)"ucs-bom", (char_u *)0L}
-#else
-			    (char_u *)NULL, PV_NONE,
-			    {(char_u *)0L, (char_u *)0L}
-#endif
 			    SCTX_INIT},
     {"fileformat",  "ff",   P_STRING|P_ALLOCED|P_VI_DEF|P_RSTAT|P_NO_MKRC
 								  |P_CURSWANT,
@@ -1416,7 +1368,7 @@ static struct vimoption options[] =
 #endif
 			    SCTX_INIT},
     {"guifontwide", "gfw",  P_STRING|P_VI_DEF|P_RCLR|P_ONECOMMA|P_NODUP,
-#if defined(FEAT_GUI) && defined(FEAT_MBYTE)
+#if defined(FEAT_GUI)
 			    (char_u *)&p_guifontwide, PV_NONE,
 			    {(char_u *)"", (char_u *)0L}
 #else
@@ -1533,7 +1485,7 @@ static struct vimoption options[] =
 			    (char_u *)&p_ic, PV_NONE,
 			    {(char_u *)FALSE, (char_u *)0L} SCTX_INIT},
     {"imactivatefunc","imaf",P_STRING|P_VI_DEF|P_SECURE,
-#if defined(FEAT_EVAL) && defined(FEAT_MBYTE)
+#if defined(FEAT_EVAL)
 			    (char_u *)&p_imaf, PV_NONE,
 			    {(char_u *)"", (char_u *)NULL}
 # else
@@ -1549,18 +1501,10 @@ static struct vimoption options[] =
 #endif
 			    {(char_u *)"", (char_u *)0L} SCTX_INIT},
     {"imcmdline",   "imc",  P_BOOL|P_VI_DEF,
-#ifdef FEAT_MBYTE
 			    (char_u *)&p_imcmdline, PV_NONE,
-#else
-			    (char_u *)NULL, PV_NONE,
-#endif
 			    {(char_u *)FALSE, (char_u *)0L} SCTX_INIT},
     {"imdisable",   "imd",  P_BOOL|P_VI_DEF,
-#ifdef FEAT_MBYTE
 			    (char_u *)&p_imdisable, PV_NONE,
-#else
-			    (char_u *)NULL, PV_NONE,
-#endif
 #ifdef __sgi
 			    {(char_u *)TRUE, (char_u *)0L}
 #else
@@ -1576,7 +1520,7 @@ static struct vimoption options[] =
 			    {(char_u *)B_IMODE_USE_INSERT, (char_u *)0L}
 			    SCTX_INIT},
     {"imstatusfunc","imsf",P_STRING|P_VI_DEF|P_SECURE,
-#if defined(FEAT_EVAL) && defined(FEAT_MBYTE)
+#if defined(FEAT_EVAL)
 			    (char_u *)&p_imsf, PV_NONE,
 			    {(char_u *)"", (char_u *)NULL}
 #else
@@ -1872,13 +1816,8 @@ static struct vimoption options[] =
 #endif
 			    SCTX_INIT},
     {"makeencoding","menc", P_STRING|P_VI_DEF,
-#ifdef FEAT_MBYTE
 			    (char_u *)&p_menc, PV_MENC,
 			    {(char_u *)"", (char_u *)0L}
-#else
-			    (char_u *)NULL, PV_NONE,
-			    {(char_u *)0L, (char_u *)0L}
-#endif
 			    SCTX_INIT},
     {"makeprg",	    "mp",   P_STRING|P_EXPAND|P_VI_DEF|P_SECURE,
 #ifdef FEAT_QUICKFIX
@@ -1901,11 +1840,7 @@ static struct vimoption options[] =
 			    (char_u *)&p_mat, PV_NONE,
 			    {(char_u *)5L, (char_u *)0L} SCTX_INIT},
     {"maxcombine",  "mco",  P_NUM|P_VI_DEF|P_CURSWANT,
-#ifdef FEAT_MBYTE
 			    (char_u *)&p_mco, PV_NONE,
-#else
-			    (char_u *)NULL, PV_NONE,
-#endif
 			    {(char_u *)2, (char_u *)0L} SCTX_INIT},
     {"maxfuncdepth", "mfd", P_NUM|P_VI_DEF,
 #ifdef FEAT_EVAL
@@ -2197,7 +2132,7 @@ static struct vimoption options[] =
 #endif
 			    SCTX_INIT},
    {"printmbcharset", "pmbcs",  P_STRING|P_VI_DEF,
-#if defined(FEAT_POSTSCRIPT) && defined(FEAT_MBYTE)
+#if defined(FEAT_POSTSCRIPT)
 			    (char_u *)&p_pmcs, PV_NONE,
 			    {(char_u *)"", (char_u *)0L}
 #else
@@ -2206,7 +2141,7 @@ static struct vimoption options[] =
 #endif
 			    SCTX_INIT},
     {"printmbfont", "pmbfn",  P_STRING|P_VI_DEF,
-#if defined(FEAT_POSTSCRIPT) && defined(FEAT_MBYTE)
+#if defined(FEAT_POSTSCRIPT)
 			    (char_u *)&p_pmfn, PV_NONE,
 			    {(char_u *)"", (char_u *)0L}
 #else
@@ -2748,13 +2683,8 @@ static struct vimoption options[] =
 #endif
 			    {(char_u *)FALSE, (char_u *)0L} SCTX_INIT},
     {"termencoding", "tenc", P_STRING|P_VI_DEF|P_RCLR,
-#ifdef FEAT_MBYTE
 			    (char_u *)&p_tenc, PV_NONE,
 			    {(char_u *)"", (char_u *)0L}
-#else
-			    (char_u *)NULL, PV_NONE,
-			    {(char_u *)0L, (char_u *)0L}
-#endif
 			    SCTX_INIT},
     {"termguicolors", "tgc", P_BOOL|P_VI_DEF|P_VIM|P_RCLR,
 #ifdef FEAT_TERMGUICOLORS
@@ -3238,9 +3168,7 @@ static struct vimoption options[] =
 
 #define PARAM_COUNT (sizeof(options) / sizeof(struct vimoption))
 
-#ifdef FEAT_MBYTE
 static char *(p_ambw_values[]) = {"single", "double", NULL};
-#endif
 static char *(p_bg_values[]) = {"light", "dark", NULL};
 static char *(p_nf_values[]) = {"bin", "octal", "hex", "alpha", NULL};
 static char *(p_ff_values[]) = {FF_UNIX, FF_DOS, FF_MAC, NULL};
@@ -3643,7 +3571,6 @@ set_init_1(int clean_arg)
 
     didset_options2();
 
-#ifdef FEAT_MBYTE
 # if defined(WIN3264) && defined(FEAT_GETTEXT)
     /*
      * If $LANG isn't set, try to get a good value for it.  This makes the
@@ -3727,7 +3654,7 @@ set_init_1(int clean_arg)
 	    }
 #endif
 
-# if defined(WIN3264) && !defined(FEAT_GUI)
+#if defined(WIN3264) && !defined(FEAT_GUI)
 	    /* Win32 console: When GetACP() returns a different value from
 	     * GetConsoleCP() set 'termencoding'. */
 	    if (GetACP() != GetConsoleCP())
@@ -3750,11 +3677,11 @@ set_init_1(int clean_arg)
 		else
 		    p_tenc = empty_option;
 	    }
-# endif
-# if defined(WIN3264) && defined(FEAT_MBYTE)
+#endif
+#if defined(WIN3264)
 	    /* $HOME may have characters in active code page. */
 	    init_homedir();
-# endif
+#endif
 	}
 	else
 	{
@@ -3762,7 +3689,6 @@ set_init_1(int clean_arg)
 	    p_enc = save_enc;
 	}
     }
-#endif
 
 #ifdef FEAT_MULTI_LANG
     /* Set the default for 'helplang'. */
@@ -3859,19 +3785,13 @@ set_options_default(
 
     for (i = 0; !istermoption(&options[i]); i++)
 	if (!(options[i].flags & P_NODEFAULT)
-#if defined(FEAT_MBYTE) || defined(FEAT_CRYPT)
 		&& (opt_flags == 0
-		    || (TRUE
-# if defined(FEAT_MBYTE)
-			&& options[i].var != (char_u *)&p_enc
-# endif
+		    || (options[i].var != (char_u *)&p_enc
 # if defined(FEAT_CRYPT)
 			&& options[i].var != (char_u *)&p_cm
 			&& options[i].var != (char_u *)&p_key
 # endif
-			))
-#endif
-			)
+			)))
 	    set_option_default(i, opt_flags, p_cp);
 
     /* The 'scroll' option must be computed for all windows. */
@@ -5018,7 +4938,6 @@ do_set(
 #endif
 								    )
 				    ++arg;	/* remove backslash */
-#ifdef FEAT_MBYTE
 				if (has_mbyte
 					&& (i = (*mb_ptr2len)(arg)) > 1)
 				{
@@ -5028,7 +4947,6 @@ do_set(
 				    s += i;
 				}
 				else
-#endif
 				    *s++ = *arg++;
 			    }
 			    *s = NUL;
@@ -5596,9 +5514,7 @@ didset_options(void)
     /* initialize the table for 'iskeyword' et.al. */
     (void)init_chartab();
 
-#ifdef FEAT_MBYTE
     (void)opt_strings_flags(p_cmp, p_cmp_values, &cmp_flags, TRUE);
-#endif
     (void)opt_strings_flags(p_bkc, p_bkc_values, &bkc_flags, TRUE);
     (void)opt_strings_flags(p_bo, p_bo_values, &bo_flags, TRUE);
 #ifdef FEAT_SESSION
@@ -5689,9 +5605,7 @@ check_buf_options(buf_T *buf)
 {
     check_string_option(&buf->b_p_bh);
     check_string_option(&buf->b_p_bt);
-#ifdef FEAT_MBYTE
     check_string_option(&buf->b_p_fenc);
-#endif
     check_string_option(&buf->b_p_ff);
 #ifdef FEAT_FIND_ID
     check_string_option(&buf->b_p_def);
@@ -5780,9 +5694,7 @@ check_buf_options(buf_T *buf)
     check_string_option(&buf->b_p_lw);
 #endif
     check_string_option(&buf->b_p_bkc);
-#ifdef FEAT_MBYTE
     check_string_option(&buf->b_p_menc);
-#endif
 #ifdef FEAT_VARTABS
     check_string_option(&buf->b_p_vsts);
     check_string_option(&buf->b_p_vts);
@@ -6318,7 +6230,6 @@ did_set_string_option(
     }
 
     /* 'ambiwidth' */
-#ifdef FEAT_MBYTE
     else if (varp == &p_ambw || varp == &p_emoji)
     {
 	if (check_opt_strings(p_ambw, p_ambw_values, FALSE) != OK)
@@ -6328,7 +6239,6 @@ did_set_string_option(
 	else if (set_chars_option(&p_fcs) != NULL)
 	    errmsg = _("E835: Conflicts with value of 'fillchars'");
     }
-#endif
 
     /* 'background' */
     else if (varp == &p_bg)
@@ -6404,7 +6314,6 @@ did_set_string_option(
 	    errmsg = e_invarg;
     }
 
-#ifdef FEAT_MBYTE
     /* 'encoding', 'fileencoding', 'termencoding' and 'makeencoding' */
     else if (varp == &p_enc || gvarp == &p_fenc || varp == &p_tenc
 							   || gvarp == &p_menc)
@@ -6419,10 +6328,10 @@ did_set_string_option(
 		errmsg = e_invarg;
 	    else
 	    {
-# ifdef FEAT_TITLE
+#ifdef FEAT_TITLE
 		/* May show a "+" in the title now. */
 		redraw_titles();
-# endif
+#endif
 		/* Add 'fileencoding' to the swap file. */
 		ml_setflags(curbuf);
 	    }
@@ -6439,29 +6348,29 @@ did_set_string_option(
 	    if (varp == &p_enc)
 	    {
 		errmsg = mb_init();
-# ifdef FEAT_TITLE
+#ifdef FEAT_TITLE
 		redraw_titles();
-# endif
-	    }
-	}
-
-# if defined(FEAT_GUI_GTK)
+#endif
+	    }
+	}
+
+#if defined(FEAT_GUI_GTK)
 	if (errmsg == NULL && varp == &p_tenc && gui.in_use)
 	{
 	    /* GTK+ 2 uses only a single encoding, and that is UTF-8. */
 	    if (STRCMP(p_tenc, "utf-8") != 0)
 		errmsg = N_("E617: Cannot be changed in the GTK+ 2 GUI");
 	}
-# endif
+#endif
 
 	if (errmsg == NULL)
 	{
-# ifdef FEAT_KEYMAP
+#ifdef FEAT_KEYMAP
 	    /* When 'keymap' is used and 'encoding' changes, reload the keymap
 	     * (with another encoding). */
 	    if (varp == &p_enc && *curbuf->b_p_keymap != NUL)
 		(void)keymap_init();
-# endif
+#endif
 
 	    /* When 'termencoding' is not empty and 'encoding' changes or when
 	     * 'termencoding' changes, need to setup for keyboard input and
@@ -6477,14 +6386,13 @@ did_set_string_option(
 		}
 	    }
 
-# if defined(WIN3264) && defined(FEAT_MBYTE)
+#if defined(WIN3264)
 	    /* $HOME may have characters in active code page. */
 	    if (varp == &p_enc)
 		init_homedir();
-# endif
-	}
-    }
-#endif
+#endif
+	}
+    }
 
 #if defined(FEAT_POSTSCRIPT)
     else if (varp == &p_penc)
@@ -6684,7 +6592,6 @@ did_set_string_option(
     /* 'matchpairs' */
     else if (gvarp == &p_mps)
     {
-#ifdef FEAT_MBYTE
 	if (has_mbyte)
 	{
 	    for (p = *varp; *p != NUL; ++p)
@@ -6711,7 +6618,6 @@ did_set_string_option(
 	    }
 	}
 	else
-#endif
 	{
 	    /* Check for "x:y,x:y" */
 	    for (p = *varp; *p != NUL; p += 4)
@@ -6971,7 +6877,6 @@ did_set_string_option(
 	redraw_gui_only = TRUE;
     }
 # endif
-# ifdef FEAT_MBYTE
     else if (varp == &p_guifontwide)
     {
 	if (STRCMP(p_guifontwide, "*") == 0)
@@ -6980,7 +6885,6 @@ did_set_string_option(
 	    errmsg = N_("E534: Invalid wide font");
 	redraw_gui_only = TRUE;
     }
-# endif
 #endif
 
 #ifdef CURSOR_SHAPE
@@ -7001,7 +6905,7 @@ did_set_string_option(
 #ifdef FEAT_PRINTER
     else if (varp == &p_popt)
 	errmsg = parse_printoptions();
-# if defined(FEAT_MBYTE) && defined(FEAT_POSTSCRIPT)
+# if defined(FEAT_POSTSCRIPT)
     else if (varp == &p_pmfn)
 	errmsg = parse_printmbfont();
 # endif
@@ -7395,14 +7299,12 @@ did_set_string_option(
 	    errmsg = e_invarg;
     }
 
-#ifdef FEAT_MBYTE
     /* 'casemap' */
     else if (varp == &p_cmp)
     {
 	if (opt_strings_flags(p_cmp, p_cmp_values, &cmp_flags, TRUE) != OK)
 	    errmsg = e_invarg;
     }
-#endif
 
 #ifdef FEAT_DIFF
     /* 'diffopt' */
@@ -8022,33 +7924,21 @@ set_chars_option(char_u **varp)
 		{
 		    c1 = c2 = c3 = 0;
 		    s = p + len + 1;
-#ifdef FEAT_MBYTE
 		    c1 = mb_ptr2char_adv(&s);
 		    if (mb_char2cells(c1) > 1)
 			continue;
-#else
-		    c1 = *s++;
-#endif
 		    if (tab[i].cp == &lcs_tab2)
 		    {
 			if (*s == NUL)
 			    continue;
-#ifdef FEAT_MBYTE
 			c2 = mb_ptr2char_adv(&s);
 			if (mb_char2cells(c2) > 1)
 			    continue;
-#else
-			c2 = *s++;
-#endif
 			if (!(*s == ',' || *s == NUL))
 			{
-#ifdef FEAT_MBYTE
 			    c3 = mb_ptr2char_adv(&s);
 			    if (mb_char2cells(c3) > 1)
 				continue;
-#else
-			    c3 = *s++;
-#endif
 			}
 		    }
 
@@ -8506,13 +8396,11 @@ set_bool_option(
     {
 	redraw_titles();
     }
-# ifdef FEAT_MBYTE
     /* when 'bomb' is changed, redraw the window title and tab page text */
     else if ((int *)varp == &curbuf->b_p_bomb)
     {
 	redraw_titles();
     }
-# endif
 #endif
 
     /* when 'bin' is set also set some other options */
@@ -8891,10 +8779,8 @@ set_bool_option(
 #endif
 	    }
 
-# ifdef FEAT_MBYTE
 	    /* set 'delcombine' */
 	    p_deco = TRUE;
-# endif
 
 # ifdef FEAT_KEYMAP
 	    /* Force-set the necessary keymap for arabic */
@@ -9210,7 +9096,6 @@ set_num_option(
     }
 #endif
 
-#ifdef FEAT_MBYTE
     /* 'maxcombine' */
     else if (pp == &p_mco)
     {
@@ -9220,7 +9105,6 @@ set_num_option(
 	    p_mco = 0;
 	screenclear();	    /* will re-allocate the screen */
     }
-#endif
 
     else if (pp == &curbuf->b_p_iminsert)
     {
@@ -10078,7 +9962,6 @@ get_highlight_default(void)
     return (char_u *)NULL;
 }
 
-#if defined(FEAT_MBYTE) || defined(PROTO)
     char_u *
 get_encoding_default(void)
 {
@@ -10089,7 +9972,6 @@ get_encoding_default(void)
 	return options[i].def_val[VI_DEFAULT];
     return (char_u *)NULL;
 }
-#endif
 
 /*
  * Translate a string like "t_xx", "<t_xx>" or "<S-Tab>" to a key number.
@@ -10794,11 +10676,9 @@ unset_global_local_option(char_u *name, 
 	    clear_string_option(&buf->b_p_lw);
 	    break;
 #endif
-#ifdef FEAT_MBYTE
 	case PV_MENC:
 	    clear_string_option(&buf->b_p_menc);
 	    break;
-#endif
     }
 }
 #endif
@@ -10853,9 +10733,7 @@ get_varp_scope(struct vimoption *p, int 
 	    case PV_LW:   return (char_u *)&(curbuf->b_p_lw);
 #endif
 	    case PV_BKC:  return (char_u *)&(curbuf->b_p_bkc);
-#ifdef FEAT_MBYTE
 	    case PV_MENC: return (char_u *)&(curbuf->b_p_menc);
-#endif
 	}
 	return NULL; /* "cannot happen" */
     }
@@ -10931,10 +10809,8 @@ get_varp(struct vimoption *p)
 	case PV_LW:	return *curbuf->b_p_lw != NUL
 				    ? (char_u *)&(curbuf->b_p_lw) : p->var;
 #endif
-#ifdef FEAT_MBYTE
 	case PV_MENC:	return *curbuf->b_p_menc != NUL
 				    ? (char_u *)&(curbuf->b_p_menc) : p->var;
-#endif
 
 #ifdef FEAT_ARABIC
 	case PV_ARAB:	return (char_u *)&(curwin->w_p_arab);
@@ -11000,9 +10876,7 @@ get_varp(struct vimoption *p)
 
 	case PV_AI:	return (char_u *)&(curbuf->b_p_ai);
 	case PV_BIN:	return (char_u *)&(curbuf->b_p_bin);
-#ifdef FEAT_MBYTE
 	case PV_BOMB:	return (char_u *)&(curbuf->b_p_bomb);
-#endif
 	case PV_BH:	return (char_u *)&(curbuf->b_p_bh);
 	case PV_BT:	return (char_u *)&(curbuf->b_p_bt);
 	case PV_BL:	return (char_u *)&(curbuf->b_p_bl);
@@ -11031,9 +10905,7 @@ get_varp(struct vimoption *p)
 	case PV_EOL:	return (char_u *)&(curbuf->b_p_eol);
 	case PV_FIXEOL:	return (char_u *)&(curbuf->b_p_fixeol);
 	case PV_ET:	return (char_u *)&(curbuf->b_p_et);
-#ifdef FEAT_MBYTE
 	case PV_FENC:	return (char_u *)&(curbuf->b_p_fenc);
-#endif
 	case PV_FF:	return (char_u *)&(curbuf->b_p_ff);
 	case PV_FT:	return (char_u *)&(curbuf->b_p_ft);
 	case PV_FO:	return (char_u *)&(curbuf->b_p_fo);
@@ -11378,9 +11250,7 @@ buf_copy_options(buf_T *buf, int flags)
 		free_buf_options(buf, TRUE);
 		buf->b_p_ro = FALSE;		/* don't copy readonly */
 		buf->b_p_tx = p_tx;
-#ifdef FEAT_MBYTE
 		buf->b_p_fenc = vim_strsave(p_fenc);
-#endif
 		switch (*p_ffs)
 		{
 		    case 'm':
@@ -11410,9 +11280,7 @@ buf_copy_options(buf_T *buf, int flags)
 	    buf->b_p_wm_nopaste = p_wm_nopaste;
 	    buf->b_p_wm_nobin = p_wm_nobin;
 	    buf->b_p_bin = p_bin;
-#ifdef FEAT_MBYTE
 	    buf->b_p_bomb = p_bomb;
-#endif
 	    buf->b_p_fixeol = p_fixeol;
 	    buf->b_p_et = p_et;
 	    buf->b_p_et_nobin = p_et_nobin;
@@ -11549,9 +11417,7 @@ buf_copy_options(buf_T *buf, int flags)
 #ifdef FEAT_LISP
 	    buf->b_p_lw = empty_option;
 #endif
-#ifdef FEAT_MBYTE
 	    buf->b_p_menc = empty_option;
-#endif
 
 	    /*
 	     * Don't copy the options set by ex_help(), use the saved values,
@@ -12137,13 +12003,10 @@ wc_use_keyname(char_u *varp, long *wcp)
  *
  * langmap_mapchar[] maps any of 256 chars to an ASCII char used for Vim
  * commands.
- * When FEAT_MBYTE is defined langmap_mapga.ga_data is a sorted table of
- * langmap_entry_T.  This does the same as langmap_mapchar[] for characters >=
- * 256.
- */
-# if defined(FEAT_MBYTE) || defined(PROTO)
-/*
- * With multi-byte support use growarray for 'langmap' chars >= 256
+ * langmap_mapga.ga_data is a sorted table of langmap_entry_T.  This does the
+ * same as langmap_mapchar[] for characters >= 256.
+ *
+ * Use growarray for 'langmap' chars >= 256
  */
 typedef struct
 {
@@ -12217,7 +12080,6 @@ langmap_adjust_mb(int c)
     }
     return c;  /* no entry found, return "c" unmodified */
 }
-# endif
 
     static void
 langmap_init(void)
@@ -12226,9 +12088,7 @@ langmap_init(void)
 
     for (i = 0; i < 256; i++)
 	langmap_mapchar[i] = i;	 /* we init with a one-to-one map */
-# ifdef FEAT_MBYTE
     ga_init2(&langmap_mapga, sizeof(langmap_entry_T), 8);
-# endif
 }
 
 /*
@@ -12242,9 +12102,7 @@ langmap_set(void)
     char_u  *p2;
     int	    from, to;
 
-#ifdef FEAT_MBYTE
     ga_clear(&langmap_mapga);		    /* clear the previous map first */
-#endif
     langmap_init();			    /* back to one-to-one map */
 
     for (p = p_langmap; p[0] != NUL; )
@@ -12268,11 +12126,7 @@ langmap_set(void)
 	    }
 	    if (p[0] == '\\' && p[1] != NUL)
 		++p;
-#ifdef FEAT_MBYTE
 	    from = (*mb_ptr2char)(p);
-#else
-	    from = p[0];
-#endif
 	    to = NUL;
 	    if (p2 == NULL)
 	    {
@@ -12281,11 +12135,7 @@ langmap_set(void)
 		{
 		    if (p[0] == '\\')
 			++p;
-#ifdef FEAT_MBYTE
 		    to = (*mb_ptr2char)(p);
-#else
-		    to = p[0];
-#endif
 		}
 	    }
 	    else
@@ -12294,11 +12144,7 @@ langmap_set(void)
 		{
 		    if (p2[0] == '\\')
 			++p2;
-#ifdef FEAT_MBYTE
 		    to = (*mb_ptr2char)(p2);
-#else
-		    to = p2[0];
-#endif
 		}
 	    }
 	    if (to == NUL)
@@ -12308,11 +12154,9 @@ langmap_set(void)
 		return;
 	    }
 
-#ifdef FEAT_MBYTE
 	    if (from >= 256)
 		langmap_set_entry(from, to);
 	    else
-#endif
 		langmap_mapchar[from & 255] = to;
 
 	    /* Advance to next pair */
@@ -12813,7 +12657,6 @@ save_file_ff(buf_T *buf)
 {
     buf->b_start_ffc = *buf->b_p_ff;
     buf->b_start_eol = buf->b_p_eol;
-#ifdef FEAT_MBYTE
     buf->b_start_bomb = buf->b_p_bomb;
 
     /* Only use free/alloc when necessary, they take time. */
@@ -12823,7 +12666,6 @@ save_file_ff(buf_T *buf)
 	vim_free(buf->b_start_fenc);
 	buf->b_start_fenc = vim_strsave(buf->b_p_fenc);
     }
-#endif
 }
 
 /*
@@ -12850,15 +12692,11 @@ file_ff_differs(buf_T *buf, int ignore_e
 	return TRUE;
     if ((buf->b_p_bin || !buf->b_p_fixeol) && buf->b_start_eol != buf->b_p_eol)
 	return TRUE;
-#ifdef FEAT_MBYTE
     if (!buf->b_p_bin && buf->b_start_bomb != buf->b_p_bomb)
 	return TRUE;
     if (buf->b_start_fenc == NULL)
 	return (*buf->b_p_fenc != NUL);
     return (STRCMP(buf->b_start_fenc, buf->b_p_fenc) != 0);
-#else
-    return FALSE;
-#endif
 }
 
 /*
@@ -13244,7 +13082,6 @@ find_mps_values(
     ptr = curbuf->b_p_mps;
     while (*ptr != NUL)
     {
-#ifdef FEAT_MBYTE
 	if (has_mbyte)
 	{
 	    char_u *prev;
@@ -13284,7 +13121,6 @@ find_mps_values(
 	    ptr += mb_ptr2len(ptr);
 	}
 	else
-#endif
 	{
 	    if (*ptr == *initc)
 	    {