diff --git a/include/meson.build b/include/meson.build
index 484c5579c..650b86e6d 100644
--- a/include/meson.build
+++ b/include/meson.build
@@ -169,11 +169,9 @@ conf_data.set('HAVE_SIGACTION', cc.has_function('sigaction') ? '1' : false)
 conf_data.set('HAVE_SIGPROCMASK', cc.has_function('sigprocmask') ? '1' : false)
 # HAVE_SOCKLEN_T is used by xtrans when IPv6 is disabled
 conf_data.set('HAVE_SOCKLEN_T', cc.has_type('socklen_t', prefix: '#include <sys/socket.h>') ? '1' : false)
-conf_data.set('HAVE_STRCASECMP', cc.has_function('strcasecmp') ? '1' : false)
 conf_data.set('HAVE_STRCASESTR', cc.has_function('strcasestr') ? '1' : false)
 conf_data.set('HAVE_STRLCAT', cc.has_function('strlcat', dependencies: libbsd_dep) ? '1' : false)
 conf_data.set('HAVE_STRLCPY', cc.has_function('strlcpy', dependencies: libbsd_dep) ? '1' : false)
-conf_data.set('HAVE_STRNCASECMP', cc.has_function('strncasecmp') ? '1' : false)
 conf_data.set('HAVE_STRNDUP', cc.has_function('strndup') and cc.has_header_symbol('string.h', 'strndup') ? '1' : false)
 # HAVE_STRUCT_SOCKADDR_STORAGE is used by xtrans >= 1.6
 conf_data.set('HAVE_STRUCT_SOCKADDR_STORAGE', cc.has_type('struct sockaddr_storage', prefix: '#include <sys/socket.h>') ? '1' : false)
diff --git a/include/os.h b/include/os.h
index 04edf0882..7f74e588c 100644
--- a/include/os.h
+++ b/include/os.h
@@ -234,18 +234,6 @@ extern _X_EXPORT void *
 reallocarray(void *optr, size_t nmemb, size_t size);
 #endif
 
-#ifndef HAVE_STRCASECMP
-#define strcasecmp xstrcasecmp
-extern _X_EXPORT int
-xstrcasecmp(const char *s1, const char *s2);
-#endif
-
-#ifndef HAVE_STRNCASECMP
-#define strncasecmp xstrncasecmp
-extern _X_EXPORT int
-xstrncasecmp(const char *s1, const char *s2, size_t n);
-#endif
-
 #ifndef HAVE_STRCASESTR
 #define strcasestr xstrcasestr
 extern _X_EXPORT char *
diff --git a/include/xorg-server.h.meson.in b/include/xorg-server.h.meson.in
index 437162cd7..4c0a01c14 100644
--- a/include/xorg-server.h.meson.in
+++ b/include/xorg-server.h.meson.in
@@ -38,9 +38,6 @@
 /* Define to 1 if you have the `reallocarray' function. */
 #mesondefine HAVE_REALLOCARRAY
 
-/* Define to 1 if you have the `strcasecmp' function. */
-#mesondefine HAVE_STRCASECMP
-
 /* Define to 1 if you have the `strcasestr' function. */
 #mesondefine HAVE_STRCASESTR
 
@@ -50,9 +47,6 @@
 /* Define to 1 if you have the `strlcpy' function. */
 #mesondefine HAVE_STRLCPY
 
-/* Define to 1 if you have the `strncasecmp' function. */
-#mesondefine HAVE_STRNCASECMP
-
 /* Define to 1 if you have the `strndup' function. */
 #mesondefine HAVE_STRNDUP
 
diff --git a/os/meson.build b/os/meson.build
index 8d5268f4d..9c8412d76 100644
--- a/os/meson.build
+++ b/os/meson.build
@@ -30,9 +30,6 @@ srcs_libc = []
 if conf_data.get('HAVE_REALLOCARRAY').to_int() == 0
     srcs_libc += 'reallocarray.c'
 endif
-if conf_data.get('HAVE_STRCASECMP').to_int() == 0
-    srcs_libc += 'strcasecmp.c'
-endif
 if conf_data.get('HAVE_STRCASESTR').to_int() == 0
     srcs_libc += 'strcasestr.c'
 endif
diff --git a/os/strcasecmp.c b/os/strcasecmp.c
index 50c2a3528..177a1467c 100644
--- a/os/strcasecmp.c
+++ b/os/strcasecmp.c
@@ -31,38 +31,3 @@
 
 #include <ctype.h>
 #include "dix.h"
-
-#ifndef HAVE_STRCASECMP
-int
-xstrcasecmp(const char *str1, const char *str2)
-{
-    const u_char *us1 = (const u_char *) str1, *us2 = (const u_char *) str2;
-
-    while (tolower(*us1) == tolower(*us2)) {
-        if (*us1++ == '\0')
-            return 0;
-        us2++;
-    }
-
-    return (tolower(*us1) - tolower(*us2));
-}
-#endif
-
-#ifndef HAVE_STRNCASECMP
-int
-xstrncasecmp(const char *s1, const char *s2, size_t n)
-{
-    if (n != 0) {
-        const u_char *us1 = (const u_char *) s1, *us2 = (const u_char *) s2;
-
-        do {
-            if (tolower(*us1) != tolower(*us2++))
-                return (tolower(*us1) - tolower(*--us2));
-            if (*us1++ == '\0')
-                break;
-        } while (--n != 0);
-    }
-
-    return 0;
-}
-#endif