diff --git a/configure b/configure
index c2094f93..7955b56f 100755
--- a/configure
+++ b/configure
@@ -4322,24 +4322,6 @@ if test "$ac_cv_header_wctype_h" != "yes" ; then
    exit 1
 fi
 
-ac_fn_c_check_func "$LINENO" "strdup" "ac_cv_func_strdup"
-if test "x$ac_cv_func_strdup" = xyes
-then :
-  printf "%s\n" "#define HAVE_STRDUP 1" >>confdefs.h
-
-fi
-ac_fn_c_check_func "$LINENO" "strcasecmp" "ac_cv_func_strcasecmp"
-if test "x$ac_cv_func_strcasecmp" = xyes
-then :
-  printf "%s\n" "#define HAVE_STRCASECMP 1" >>confdefs.h
-
-fi
-ac_fn_c_check_func "$LINENO" "strncasecmp" "ac_cv_func_strncasecmp"
-if test "x$ac_cv_func_strncasecmp" = xyes
-then :
-  printf "%s\n" "#define HAVE_STRNCASECMP 1" >>confdefs.h
-
-fi
 ac_fn_c_check_func "$LINENO" "setenv" "ac_cv_func_setenv"
 if test "x$ac_cv_func_setenv" = xyes
 then :
diff --git a/configure.ac b/configure.ac
index 418413a3..21d1819c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -109,7 +109,7 @@ if test "$ac_cv_header_wctype_h" != "yes" ; then
    exit 1
 fi
 
-AC_CHECK_FUNCS(strdup strcasecmp strncasecmp setenv unsetenv glob mbstowcs setlocale initgroups inotify_init1 readline)
+AC_CHECK_FUNCS(setenv unsetenv glob mbstowcs setlocale initgroups inotify_init1 readline)
 
 if test "$ac_cv_func_mbstowcs" != "yes"; then
    echo "*** Remind requires the mbstowcs function"
diff --git a/src/calendar.c b/src/calendar.c
index edd060d3..126137e6 100644
--- a/src/calendar.c
+++ b/src/calendar.c
@@ -2117,7 +2117,7 @@ static int DoCalRem(ParsePtr p, int col)
         }
     }
     if (trig.typ == PASSTHRU_TYPE) {
-        if (!PsCal && !StrCmpi(trig.passthru, "SHADE")) {
+        if (!PsCal && !strcasecmp(trig.passthru, "SHADE")) {
             if (dse == DSEToday) {
                 DBufInit(&obuf);
                 r = DoSubst(p, &obuf, &trig, &tim, dse, CAL_MODE);
@@ -2130,7 +2130,7 @@ static int DoCalRem(ParsePtr p, int col)
                 DBufFree(&obuf);
             }
         }
-        if (!PsCal && !StrCmpi(trig.passthru, "WEEK")) {
+        if (!PsCal && !strcasecmp(trig.passthru, "WEEK")) {
             if (dse == DSEToday) {
                 DBufInit(&obuf);
                 r = DoSubst(p, &obuf, &trig, &tim, dse, CAL_MODE);
@@ -2143,11 +2143,11 @@ static int DoCalRem(ParsePtr p, int col)
                 DBufFree(&obuf);
             }
         }
-        if (!PsCal && StrCmpi(trig.passthru, "COLOR") && StrCmpi(trig.passthru, "COLOUR") && StrCmpi(trig.passthru, "MOON")) {
+        if (!PsCal && strcasecmp(trig.passthru, "COLOR") && strcasecmp(trig.passthru, "COLOUR") && strcasecmp(trig.passthru, "MOON")) {
             FreeTrig(&trig);
             return OK;
         }
-        if (!PsCal && !StrCmpi(trig.passthru, "MOON")) {
+        if (!PsCal && !strcasecmp(trig.passthru, "MOON")) {
             if (dse == DSEToday) {
                 DBufInit(&obuf);
                 r = DoSubst(p, &obuf, &trig, &tim, dse, CAL_MODE);
@@ -2160,8 +2160,8 @@ static int DoCalRem(ParsePtr p, int col)
                 DBufFree(&obuf);
             }
         }
-        if (!StrCmpi(trig.passthru, "COLOR") ||
-            !StrCmpi(trig.passthru, "COLOUR")) {
+        if (!strcasecmp(trig.passthru, "COLOR") ||
+            !strcasecmp(trig.passthru, "COLOUR")) {
             is_color = 1;
             /* Strip off the three color numbers */
             DBufFree(&buf);
@@ -2225,8 +2225,8 @@ static int DoCalRem(ParsePtr p, int col)
             /* Suppress time if it's not today or if it's a non-COLOR special */
             if (dse != DSEToday ||
                 (trig.typ == PASSTHRU_TYPE &&
-                 StrCmpi(trig.passthru, "COLOUR") &&
-                 StrCmpi(trig.passthru, "COLOR"))) {
+                 strcasecmp(trig.passthru, "COLOUR") &&
+                 strcasecmp(trig.passthru, "COLOR"))) {
                 if (DBufPuts(&obuf, SimpleTime(NO_TIME)) != OK) {
                     DBufFree(&obuf);
                     DBufFree(&raw_buf);
@@ -2335,7 +2335,7 @@ static int DoCalRem(ParsePtr p, int col)
         e->if_depth = get_if_pointer() - get_base_if_pointer();
         e->trig = trig;
         if (e->trig.tz) {
-            e->trig.tz = StrDup(e->trig.tz);
+            e->trig.tz = strdup(e->trig.tz);
         }
         e->tt = tim;
         e->wc_pos = NULL;
@@ -2344,8 +2344,8 @@ static int DoCalRem(ParsePtr p, int col)
         e->r = col_r;
         e->g = col_g;
         e->b = col_b;
-        e->text = StrDup(s);
-        e->raw_text = StrDup(DBufValue(&raw_buf));
+        e->text = strdup(s);
+        e->raw_text = strdup(DBufValue(&raw_buf));
         DBufFree(&raw_buf);
         DBufFree(&obuf);
         DBufFree(&pre_buf);
@@ -2661,7 +2661,7 @@ static void WriteSimpleEntryProtocol2(CalEntry *e)
         PrintJSONKeyPairInt("r", e->r);
         PrintJSONKeyPairInt("g", e->g);
         PrintJSONKeyPairInt("b", e->b);
-    } else if (!StrCmpi(e->passthru, "SHADE")) {
+    } else if (!strcasecmp(e->passthru, "SHADE")) {
         int r, g, b, n;
         n = sscanf(e->text, "%d %d %d", &r, &g, &b);
         if (n < 3) {
diff --git a/src/config.h.in b/src/config.h.in
index 7aea6589..81963f14 100644
--- a/src/config.h.in
+++ b/src/config.h.in
@@ -45,21 +45,12 @@
 /* Define to 1 if you have the `readline' function. */
 #undef HAVE_READLINE
 
-/* Define to 1 if you have the `strcasecmp' function. */
-#undef HAVE_STRCASECMP
-
-/* Define to 1 if you have the `strdup' function. */
-#undef HAVE_STRDUP
-
 /* Define to 1 if you have the <strings.h> header file. */
 #undef HAVE_STRINGS_H
 
 /* Define to 1 if you have the <string.h> header file. */
 #undef HAVE_STRING_H
 
-/* Define to 1 if you have the `strncasecmp' function. */
-#undef HAVE_STRNCASECMP
-
 /* Define to 1 if you have the <sys/inotify.h> header file. */
 #undef HAVE_SYS_INOTIFY_H
 
diff --git a/src/dedupe.c b/src/dedupe.c
index 9129350a..fd582c02 100644
--- a/src/dedupe.c
+++ b/src/dedupe.c
@@ -101,7 +101,7 @@ InsertDedupeEntry(int trigger_date, int trigger_time, char const *body)
     }
     e->trigger_date = trigger_date;
     e->trigger_time = trigger_time;
-    e->body = StrDup(body);
+    e->body = strdup(body);
     if (!e->body) {
         free(e);
         return;
diff --git a/src/dorem.c b/src/dorem.c
index a40ab77e..6285d0b8 100644
--- a/src/dorem.c
+++ b/src/dorem.c
@@ -306,11 +306,11 @@ ensure_satnode_mentions_trigdate_aux(expr_node *node, int *mentioned)
         } else {
             name = node->u.value.v.str;
         }
-        if (!StrCmpi(name, "T") ||
-            !StrCmpi(name, "Td") ||
-            !StrCmpi(name, "Tm") ||
-            !StrCmpi(name, "Tw") ||
-            !StrCmpi(name, "Ty")) {
+        if (!strcasecmp(name, "T") ||
+            !strcasecmp(name, "Td") ||
+            !strcasecmp(name, "Tm") ||
+            !strcasecmp(name, "Tw") ||
+            !strcasecmp(name, "Ty")) {
             *mentioned = 1;
             return;
         }
@@ -1120,7 +1120,7 @@ int ParseRem(ParsePtr s, Trigger *trig, TimeTrig *tim)
             if (r != OK) {
                 return r;
             }
-            trig->tz = StrDup(DBufValue(&buf));
+            trig->tz = strdup(DBufValue(&buf));
             if (!trig->tz) {
                 return E_NO_MEM;
             }
@@ -1576,14 +1576,14 @@ int TriggerReminder(ParsePtr p, Trigger *t, TimeTrig const *tim, int dse, int is
     DBufInit(&calRow);
     DBufInit(&pre_buf);
     if (t->typ == RUN_TYPE && RunDisabled) return E_RUN_DISABLED;
-    if ((t->typ == PASSTHRU_TYPE && StrCmpi(t->passthru, "COLOR") && StrCmpi(t->passthru, "COLOUR")) ||
+    if ((t->typ == PASSTHRU_TYPE && strcasecmp(t->passthru, "COLOR") && strcasecmp(t->passthru, "COLOUR")) ||
         t->typ == CAL_TYPE ||
         t->typ == PS_TYPE ||
         t->typ == PSF_TYPE)
         return OK;
 
     /* Handle COLOR types */
-    if (t->typ == PASSTHRU_TYPE && (!StrCmpi(t->passthru, "COLOR") || !StrCmpi(t->passthru, "COLOUR"))) {
+    if (t->typ == PASSTHRU_TYPE && (!strcasecmp(t->passthru, "COLOR") || !strcasecmp(t->passthru, "COLOUR"))) {
         /* Strip off three tokens */
         r = ParseToken(p, &buf);
         sscanf(DBufValue(&buf), "%d", &red);
@@ -2291,17 +2291,17 @@ void FixSpecialType(Trigger *t)
     }
 
     /* Convert SPECIAL MSG / MSF / RUN / CAL to just plain MSG / MSF / etc */
-    if (!StrCmpi(t->passthru, "MSG")) {
+    if (!strcasecmp(t->passthru, "MSG")) {
         t->typ = MSG_TYPE;
-    } else if (!StrCmpi(t->passthru, "MSF")) {
+    } else if (!strcasecmp(t->passthru, "MSF")) {
         t->typ = MSF_TYPE;
-    } else if (!StrCmpi(t->passthru, "RUN")) {
+    } else if (!strcasecmp(t->passthru, "RUN")) {
         t->typ = RUN_TYPE;
-    } else if (!StrCmpi(t->passthru, "CAL")) {
+    } else if (!strcasecmp(t->passthru, "CAL")) {
         t->typ = CAL_TYPE;
-    } else if (!StrCmpi(t->passthru, "PS")) {
+    } else if (!strcasecmp(t->passthru, "PS")) {
         t->typ = PS_TYPE;
-    } else if (!StrCmpi(t->passthru, "PSFILE")) {
+    } else if (!strcasecmp(t->passthru, "PSFILE")) {
         t->typ = PSF_TYPE;
     }
 }
diff --git a/src/expr.c b/src/expr.c
index ae2775f2..b2ea828b 100644
--- a/src/expr.c
+++ b/src/expr.c
@@ -2256,7 +2256,7 @@ static int make_atom(expr_node *atom, Var *locals)
     /* Variable */
     if (isalpha(*s) || *s == '_') {
         while(v) {
-            if (! StrinCmp(s, v->name, VAR_NAME_LEN)) {
+            if (! strncasecmp(s, v->name, VAR_NAME_LEN)) {
                 atom->type = N_LOCAL_VAR;
                 atom->u.arg = i;
                 return OK;
@@ -3139,7 +3139,7 @@ int CopyValue(Value *dest, const Value *src)
 {
     dest->type = ERR_TYPE;
     if (src->type == STR_TYPE) {
-        dest->v.str = StrDup(src->v.str);
+        dest->v.str = strdup(src->v.str);
         if (!dest->v.str) return E_NO_MEM;
     } else {
         dest->v.val = src->v.val;
@@ -3312,7 +3312,7 @@ int DoCoerce(char type, Value *v)
         default: return E_CANT_COERCE;
         }
         v->type = STR_TYPE;
-        v->v.str = StrDup(coerce_buf);
+        v->v.str = strdup(coerce_buf);
         if (!v->v.str) {
             v->type = ERR_TYPE;
             return E_NO_MEM;
diff --git a/src/files.c b/src/files.c
index 7dca63e5..884680ca 100644
--- a/src/files.c
+++ b/src/files.c
@@ -159,7 +159,7 @@ void SetCurrentFilename(char const *fname)
             fprintf(ErrFp, "Out of Memory!\n");
             exit(1);
         }
-        e->fname = StrDup(fname);
+        e->fname = strdup(fname);
         if (!e->fname) {
             fprintf(ErrFp, "Out of Memory!\n");
             exit(1);
@@ -559,7 +559,7 @@ static int CacheFile(char const *fname, int use_pclose)
         return E_NO_MEM;
     }
     cf->cache = NULL;
-    cf->filename = StrDup(fname);
+    cf->filename = strdup(fname);
     if (!cf->filename) {
         ShouldCache = 0;
         if (use_pclose) {
@@ -627,7 +627,7 @@ static int CacheFile(char const *fname, int use_pclose)
             cl->next = NULL;
             cl->LineNo = LineNo;
             cl->LineNoStart = LineNoStart;
-            cl->text = StrDup(s);
+            cl->text = strdup(s);
             DBufFree(&LineBuffer);
             if (!cl->text) {
                 DestroyCache(cf);
@@ -874,7 +874,7 @@ static int SetupGlobChain(char const *dirname, IncludeStruct *i)
     i->chain = NULL;
     if (!*dirname) return E_CANT_OPEN;
 
-    dir = StrDup(dirname);
+    dir = strdup(dirname);
     if (!dir) return E_NO_MEM;
 
     /* Strip trailing slashes off directory */
@@ -916,7 +916,7 @@ static int SetupGlobChain(char const *dirname, IncludeStruct *i)
     if (ShouldCache) {
         dc = malloc(sizeof(DirectoryFilenameChain));
         if (dc) {
-            dc->dirname = StrDup(dir);
+            dc->dirname = strdup(dir);
             if (!dc->dirname) {
                 free(dc);
                 dc = NULL;
@@ -972,7 +972,7 @@ static int SetupGlobChain(char const *dirname, IncludeStruct *i)
             return E_NO_MEM;
         }
 
-        ch->filename = StrDup(glob_buf.gl_pathv[r]);
+        ch->filename = strdup(glob_buf.gl_pathv[r]);
         if (!ch->filename) {
             globfree(&glob_buf);
             FreeChain(i->chain);
diff --git a/src/funcs.c b/src/funcs.c
index e8076e83..961160d1 100644
--- a/src/funcs.c
+++ b/src/funcs.c
@@ -448,7 +448,7 @@ static int RetStrVal(char const *s, func_info *info)
         RetVal.v.str = malloc(1);
         if (RetVal.v.str) *RetVal.v.str = 0;
     } else {
-        RetVal.v.str = StrDup(s);
+        RetVal.v.str = strdup(s);
     }
 
     if (!RetVal.v.str) {
@@ -652,11 +652,11 @@ static int FCoerce(func_info *info)
        it won't be destroyed */
     DCOPYVAL(RetVal, ARG(1));
 
-    if (! StrCmpi(s, "int")) r =  DoCoerce(INT_TYPE, &RetVal);
-    else if (! StrCmpi(s, "date")) r =  DoCoerce(DATE_TYPE, &RetVal);
-    else if (! StrCmpi(s, "time")) r =  DoCoerce(TIME_TYPE, &RetVal);
-    else if (! StrCmpi(s, "string")) r =  DoCoerce(STR_TYPE, &RetVal);
-    else if (! StrCmpi(s, "datetime")) r =  DoCoerce(DATETIME_TYPE, &RetVal);
+    if (! strcasecmp(s, "int")) r =  DoCoerce(INT_TYPE, &RetVal);
+    else if (! strcasecmp(s, "date")) r =  DoCoerce(DATE_TYPE, &RetVal);
+    else if (! strcasecmp(s, "time")) r =  DoCoerce(TIME_TYPE, &RetVal);
+    else if (! strcasecmp(s, "string")) r =  DoCoerce(STR_TYPE, &RetVal);
+    else if (! strcasecmp(s, "datetime")) r =  DoCoerce(DATETIME_TYPE, &RetVal);
     else {
         Eprint("coerce(): Invalid type `%s'", s);
         return E_CANT_COERCE;
@@ -3537,7 +3537,7 @@ static int UTCToLocalHelper(int datetime, int *ret)
 
     old_tz = getenv("TZ");
     if (old_tz) {
-        old_tz = StrDup(old_tz);
+        old_tz = strdup(old_tz);
         if (!old_tz) return E_NO_MEM;
     }
 
@@ -4281,7 +4281,7 @@ int tz_convert(int year, int month, int day,
     /* backup old TZ env var */
     old_tz = getenv("TZ");
     if (old_tz) {
-        old_tz = StrDup(old_tz);
+        old_tz = strdup(old_tz);
         if (!old_tz) return E_NO_MEM;
     }
     if (tgt_tz == NULL || !*tgt_tz) {
diff --git a/src/hbcal.c b/src/hbcal.c
index d5ff6473..e81cf7a5 100644
--- a/src/hbcal.c
+++ b/src/hbcal.c
@@ -262,14 +262,14 @@ int HebNameToNum(char const *mname)
     int m=-1;
 
     for (i=0; i<14; i++) {
-        if (!StrCmpi(mname, HebMonthNames[i])) {
+        if (!strcasecmp(mname, HebMonthNames[i])) {
             m = i;
             break;
         }
     }
     if (m == -1) {
         for (i=0; i<14; i++) {
-            if (!StrCmpi(mname, IvritMonthNames[i])) {
+            if (!strcasecmp(mname, IvritMonthNames[i])) {
                 m = i;
                 break;
             }
diff --git a/src/init.c b/src/init.c
index 6773ba5e..f330020b 100644
--- a/src/init.c
+++ b/src/init.c
@@ -196,7 +196,7 @@ void InitRemind(int argc, char const *argv[])
     /* Initialize local time zone */
     LocalTimeZone = getenv("TZ");
     if (LocalTimeZone) {
-        LocalTimeZone = StrDup(LocalTimeZone);
+        LocalTimeZone = strdup(LocalTimeZone);
         if (!LocalTimeZone) {
             fprintf(stderr, "Out of memory!\n");
             exit(1);
diff --git a/src/main.c b/src/main.c
index ec75e140..7b2fc9eb 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1516,11 +1516,11 @@ int DoRun(ParsePtr p)
     if ( (r=ParseToken(p, &buf)) ) return r;
 
 /* Only allow RUN ON in top-level script */
-    if (! StrCmpi(DBufValue(&buf), "ON")) {
+    if (! strcasecmp(DBufValue(&buf), "ON")) {
         if (TopLevel()) RunDisabled &= ~RUN_SCRIPT;
     }
 /* But allow RUN OFF anywhere */
-    else if (! StrCmpi(DBufValue(&buf), "OFF"))
+    else if (! strcasecmp(DBufValue(&buf), "OFF"))
         RunDisabled |= RUN_SCRIPT;
     else {
         DBufFree(&buf);
@@ -1548,11 +1548,11 @@ int DoExpr(ParsePtr p)
     if ( (r=ParseToken(p, &buf)) ) return r;
 
 /* Only allow EXPR ON in top-level script */
-    if (! StrCmpi(DBufValue(&buf), "ON")) {
+    if (! strcasecmp(DBufValue(&buf), "ON")) {
         if (TopLevel()) ExpressionEvaluationDisabled = 0;
     }
 /* But allow EXPR OFF anywhere */
-    else if (! StrCmpi(DBufValue(&buf), "OFF"))
+    else if (! strcasecmp(DBufValue(&buf), "OFF"))
         ExpressionEvaluationDisabled = 1;
     else {
         DBufFree(&buf);
@@ -2117,7 +2117,7 @@ SaveLastTrigger(Trigger const *t)
     DBufInit(&(LastTrigger.tags));
 
     if (LastTrigger.tz) {
-        LastTrigger.tz = StrDup(LastTrigger.tz);
+        LastTrigger.tz = strdup(LastTrigger.tz);
     }
     DBufPuts(&(LastTrigger.tags), DBufValue(&(t->tags)));
     TrigInfo *cur = t->infos;
diff --git a/src/protos.h b/src/protos.h
index cfd6d621..62fe9a9c 100644
--- a/src/protos.h
+++ b/src/protos.h
@@ -13,20 +13,8 @@
 /* Suppress unused variable warnings */
 #define UNUSED(x) (void) x
 
-#ifdef HAVE_STRDUP
-#define StrDup strdup
-#endif
-
-#ifdef HAVE_STRNCASECMP
-#define StrinCmp strncasecmp
-#endif
-
-#ifdef HAVE_STRCASECMP
-#define StrCmpi strcasecmp
-#endif
-
 /* Define a string assignment macro - be careful!!! */
-#define STRSET(x, str) { if (x) free(x); (x) = StrDup(str); }
+#define STRSET(x, str) { if (x) free(x); (x) = strdup(str); }
 
 /* Define a general malloc routine for creating pointers to objects */
 #define NEW(type) (malloc(sizeof(type)))
@@ -131,18 +119,6 @@ int ComputeTriggerNoAdjustDuration (int today, Trigger *trig, TimeTrig const *ti
 int AdjustTriggerForDuration(int today, int r, Trigger *trig, TimeTrig *tim, int save_in_globals);
 char *StrnCpy (char *dest, char const *source, int n);
 
-#ifndef HAVE_STRNCASECMP
-int StrinCmp (char const *s1, char const *s2, int n);
-#endif
-
-#ifndef HAVE_STRDUP
-char *StrDup (char const *s);
-#endif
-
-#ifndef HAVE_STRCASECMP
-int StrCmpi (char const *s1, char const *s2);
-#endif
-
 void strtolower(char *s);
 
 Var *FindVar (char const *str, int create);
diff --git a/src/queue.c b/src/queue.c
index 996ad486..31546ec1 100644
--- a/src/queue.c
+++ b/src/queue.c
@@ -155,7 +155,7 @@ int QueueReminder(ParsePtr p, Trigger *trig,
     qelem->red = DefaultColorR;
     qelem->green = DefaultColorG;
     qelem->blue = DefaultColorB;
-    qelem->text = StrDup(p->pos);  /* Guaranteed that parser is not nested. */
+    qelem->text = strdup(p->pos);  /* Guaranteed that parser is not nested. */
     if (!qelem->text) {
         free(qelem);
         return E_NO_MEM;
diff --git a/src/rem2ps.c b/src/rem2ps.c
index 41d81f82..e368c28c 100644
--- a/src/rem2ps.c
+++ b/src/rem2ps.c
@@ -154,24 +154,6 @@ put_escaped_string(char const *s)
     }
 }
 
-/***************************************************************/
-/*                                                             */
-/*  StrCmpi                                                    */
-/*                                                             */
-/*  Compare strings, case insensitive.                         */
-/*                                                             */
-/***************************************************************/
-static int StrCmpi(char const *s1, char const *s2)
-{
-    int r;
-    while (*s1 && *s2) {
-        r = toupper(*s1) - toupper(*s2);
-        if (r) return r;
-        s1++;
-        s2++;
-    }
-    return toupper(*s1) - toupper(*s2);
-}
 /***************************************************************/
 /*                                                             */
 /*   Parse the new-style JSON intermediate format              */
@@ -229,18 +211,18 @@ JSONToCalEntry(DynamicBuffer const *buf)
         } else if (!strcmp(nm, "passthru")) {
             if (v->type == json_string) {
                 s = v->u.string.ptr;
-                if (!StrCmpi(s, "PostScript")) {
+                if (!strcasecmp(s, "PostScript")) {
                     c->special = SPECIAL_POSTSCRIPT;
-                } else if (!StrCmpi(s, "SHADE")) {
+                } else if (!strcasecmp(s, "SHADE")) {
                     c->special = SPECIAL_SHADE;
-                } else if (!StrCmpi(s, "MOON")) {
+                } else if (!strcasecmp(s, "MOON")) {
                     c->special = SPECIAL_MOON;
-                } else if (!StrCmpi(s, "WEEK")) {
+                } else if (!strcasecmp(s, "WEEK")) {
                     c->special = SPECIAL_WEEK;
-                } else if (!StrCmpi(s, "PSFile")) {
+                } else if (!strcasecmp(s, "PSFile")) {
                     c->special = SPECIAL_PSFILE;
-                } else if (!StrCmpi(s, "COLOUR") ||
-                           !StrCmpi(s, "COLOR")) {
+                } else if (!strcasecmp(s, "COLOUR") ||
+                           !strcasecmp(s, "COLOR")) {
                     c->special = SPECIAL_COLOR;
                 } else {
                     c->special = SPECIAL_UNKNOWN;
@@ -301,20 +283,20 @@ TextToCalEntry(DynamicBuffer *buf)
     strcpy(c->entry, startOfBody);
 
     /* Save the type of SPECIAL */
-    if (!StrCmpi(passthru, "PostScript")) {
+    if (!strcasecmp(passthru, "PostScript")) {
         c->special = SPECIAL_POSTSCRIPT;
-    } else if (!StrCmpi(passthru, "SHADE")) {
+    } else if (!strcasecmp(passthru, "SHADE")) {
         c->special = SPECIAL_SHADE;
-    } else if (!StrCmpi(passthru, "MOON")) {
+    } else if (!strcasecmp(passthru, "MOON")) {
         c->special = SPECIAL_MOON;
-    } else if (!StrCmpi(passthru, "WEEK")) {
+    } else if (!strcasecmp(passthru, "WEEK")) {
         c->special = SPECIAL_WEEK;
-    } else if (!StrCmpi(passthru, "PSFile")) {
+    } else if (!strcasecmp(passthru, "PSFile")) {
         c->special = SPECIAL_PSFILE;
-    } else if (!StrCmpi(passthru, "COLOUR") ||
-               !StrCmpi(passthru, "COLOR")) {
+    } else if (!strcasecmp(passthru, "COLOUR") ||
+               !strcasecmp(passthru, "COLOR")) {
         c->special = SPECIAL_COLOR;
-    } else if (StrCmpi(passthru, "*")) {
+    } else if (strcasecmp(passthru, "*")) {
         c->special = SPECIAL_UNKNOWN;
     }
     return c;
diff --git a/src/sort.c b/src/sort.c
index 4bccc454..7fc4b650 100644
--- a/src/sort.c
+++ b/src/sort.c
@@ -49,7 +49,7 @@ static Sortrem *MakeSortRem(int dse, int tim, char const *body, int typ, int pri
     Sortrem *new = NEW(Sortrem);
     if (!new) return NULL;
 
-    new->text = StrDup(body);
+    new->text = strdup(body);
     if (!new->text) {
         free(new);
         return NULL;
diff --git a/src/trans.c b/src/trans.c
index 3e2c1bcb..761e22dc 100644
--- a/src/trans.c
+++ b/src/trans.c
@@ -443,19 +443,19 @@ DoTranslate(ParsePtr p)
         r = ParseToken(p, &orig);
         if (r) return r;
         r = VerifyEoln(p);
-        if (!StrCmpi(DBufValue(&orig), "dump")) {
+        if (!strcasecmp(DBufValue(&orig), "dump")) {
             DBufFree(&orig);
             if (r) return r;
             DumpTranslationTable(stdout, 0);
             return OK;
         }
-        if (!StrCmpi(DBufValue(&orig), "clear")) {
+        if (!strcasecmp(DBufValue(&orig), "clear")) {
             DBufFree(&orig);
             if (r) return r;
             ClearTranslationTable();
             return OK;
         }
-        if (!StrCmpi(DBufValue(&orig), "generate")) {
+        if (!strcasecmp(DBufValue(&orig), "generate")) {
             DBufFree(&orig);
             if (r) return r;
             GenerateTranslationTemplate();
diff --git a/src/trigger.c b/src/trigger.c
index 36de4e3d..b305b299 100644
--- a/src/trigger.c
+++ b/src/trigger.c
@@ -738,7 +738,7 @@ NewTrigInfo(char const *i)
         return NULL;
     }
     ti->next = NULL;
-    ti->info = StrDup(i);
+    ti->info = strdup(i);
     if (!ti->info) {
         free(ti);
         return NULL;
diff --git a/src/userfns.c b/src/userfns.c
index 5800601e..b11d0bf1 100644
--- a/src/userfns.c
+++ b/src/userfns.c
@@ -318,7 +318,7 @@ int DoFset(ParsePtr p)
             }
             /* If we've already seen this local variable, error */
             for (i=0; i<func->nargs; i++) {
-                if (!StrinCmp(DBufValue(&buf), local_array[i].name, VAR_NAME_LEN)) {
+                if (!strncasecmp(DBufValue(&buf), local_array[i].name, VAR_NAME_LEN)) {
                     DBufFree(&buf);
                     DestroyUserFunc(func);
                     return E_REPEATED_ARG;
@@ -393,7 +393,7 @@ int DoFset(ParsePtr p)
             return E_NO_MEM;
         }
         for (i=0; i<func->nargs; i++) {
-            func->args[i] = StrDup(local_array[i].name);
+            func->args[i] = strdup(local_array[i].name);
             if (!func->args[i]) {
                 DestroyUserFunc(func);
                 return E_NO_MEM;
@@ -619,7 +619,7 @@ static UserFunc *clone_userfunc(char const *name, int *r)
             return NULL;
         }
         for (i=0; i<dest->nargs; i++) {
-            dest->args[i] = StrDup(src->args[i]);
+            dest->args[i] = strdup(src->args[i]);
             if (!dest->args[i]) {
                 DestroyUserFunc(dest);
                 return NULL;
diff --git a/src/utils.c b/src/utils.c
index 016129ec..1d241bd1 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -140,67 +140,6 @@ char *StrnCpy(char *dest, char const *source, int n)
     return odest;
 }
 
-#ifndef HAVE_STRNCASECMP
-/***************************************************************/
-/*                                                             */
-/*  StrinCmp - compare strings, case-insensitive               */
-/*                                                             */
-/***************************************************************/
-int StrinCmp(char const *s1, char const *s2, int n)
-{
-    register int r;
-    while (n && *s1 && *s2) {
-        n--;
-        r = toupper(*s1) - toupper(*s2);
-        if (r) return r;
-        s1++;
-        s2++;
-    }
-    if (n) return (toupper(*s1) - toupper(*s2)); else return 0;
-}
-
-#endif
-
-#ifndef HAVE_STRDUP
-/***************************************************************/
-/*                                                             */
-/*  StrDup                                                     */
-/*                                                             */
-/*  Like ANSI strdup                                           */
-/*                                                             */
-/***************************************************************/
-char *StrDup(char const *s)
-{
-    char *ret = malloc(strlen(s)+1);
-    if (!ret) return NULL;
-    strcpy(ret, s);
-    return ret;
-}
-
-#endif
-
-#ifndef HAVE_STRCASECMP
-/***************************************************************/
-/*                                                             */
-/*  StrCmpi                                                    */
-/*                                                             */
-/*  Compare strings, case insensitive.                         */
-/*                                                             */
-/***************************************************************/
-int StrCmpi(char const *s1, char const *s2)
-{
-    int r;
-    while (*s1 && *s2) {
-        r = toupper(*s1) - toupper(*s2);
-        if (r) return r;
-        s1++;
-        s2++;
-    }
-    return toupper(*s1) - toupper(*s2);
-}
-
-#endif
-
 /***************************************************************/
 /*                                                             */
 /*  DateOK                                                     */
diff --git a/src/var.c b/src/var.c
index 98bf7948..f5b0ee54 100644
--- a/src/var.c
+++ b/src/var.c
@@ -52,7 +52,7 @@ static int VarCompareFunc(void const *a, void const *b)
 {
     Var *x = (Var *) a;
     Var *y = (Var *) b;
-    return StrCmpi(x->name, y->name);
+    return strcasecmp(x->name, y->name);
 }
 
 void
@@ -220,15 +220,15 @@ static int warning_level_func(int do_set, Value *val)
         if (!strcmp(val->v.str, VERSION)) {
             WarningLevel = NULL;
         } else {
-            WarningLevel = StrDup(val->v.str);
+            WarningLevel = strdup(val->v.str);
             if (!WarningLevel) return E_NO_MEM;
         }
         return OK;
     }
     if (!WarningLevel) {
-        val->v.str = StrDup(VERSION);
+        val->v.str = strdup(VERSION);
     } else {
-        val->v.str = StrDup(WarningLevel);
+        val->v.str = strdup(WarningLevel);
     }
     if (!val->v.str) {
         return E_NO_MEM;
@@ -257,14 +257,14 @@ static int oncefile_func(int do_set, Value *val)
         if (OnceFile) {
             free( (void *) OnceFile);
         }
-        OnceFile = StrDup(val->v.str);
+        OnceFile = strdup(val->v.str);
         if (!OnceFile) return E_NO_MEM;
         return OK;
     }
     if (!OnceFile) {
-        val->v.str = StrDup("");
+        val->v.str = strdup("");
     } else {
-        val->v.str = StrDup(OnceFile);
+        val->v.str = strdup(OnceFile);
     }
     if (!val->v.str) return E_NO_MEM;
     val->type = STR_TYPE;
@@ -1397,9 +1397,9 @@ static int GetTranslatableVariable(SysVar const *v, Value *value)
 {
     char const *translated = tr((char const *) v->value);
     if (translated) {
-        value->v.str = StrDup(translated);
+        value->v.str = strdup(translated);
     } else {
-        value->v.str = StrDup("");
+        value->v.str = strdup("");
     }
     if (!value->v.str) return E_NO_MEM;
     value->type = STR_TYPE;
@@ -1491,9 +1491,9 @@ int GetSysVar(char const *name, Value *val)
         return f(0, val);
     } else if (v->type == STR_TYPE) {
         if (! * (char **) v->value) {
-            val->v.str = StrDup("");
+            val->v.str = strdup("");
         } else {
-            val->v.str = StrDup(*((char **) v->value));
+            val->v.str = strdup(*((char **) v->value));
         }
         if (!val->v.str) return E_NO_MEM;
     } else {
@@ -1524,7 +1524,7 @@ SysVar *FindSysVar(char const *name)
     int r;
 
     while (top >= bottom) {
-        r = StrCmpi(name, SysVarArr[mid].name);
+        r = strcasecmp(name, SysVarArr[mid].name);
         if (!r) return &SysVarArr[mid];
         else if (r>0) bottom = mid+1;
         else        top = mid-1;