diff --git a/admin/merge-gnulib b/admin/merge-gnulib
index 6d60dcd687a..532a9a46931 100755
--- a/admin/merge-gnulib
+++ b/admin/merge-gnulib
@@ -43,7 +43,7 @@ GNULIB_MODULES='
   free-posix fstatat fsusage fsync futimens
   getline getloadavg getopt-gnu getrandom gettime gettimeofday gitlog-to-changelog
   ieee754-h ignore-value intprops largefile libgmp lstat
-  malloc-gnu manywarnings memmem-simple mempcpy memrchr memset_explicit
+  malloc-gnu manywarnings memeq memmem-simple mempcpy memrchr memset_explicit
   minmax mkostemp mktime
   nanosleep nproc nstrftime-limited
   pathmax pipe2 pselect pthread_sigmask
@@ -51,7 +51,7 @@ GNULIB_MODULES='
   sig2str sigdescr_np socklen stat-time std-gnu23
   stdc_bit_width stdc_count_ones stdc_trailing_zeros
   stdckdint-h stddef-h stdio-h stdio-windows
-  stpcpy stringeq strnlen strtoimax symlink sys_stat-h sys_time-h
+  stpcpy streq strnlen strtoimax symlink sys_stat-h sys_time-h
   tempname time-h time_r time_rz timegm timer-time timespec-add timespec-sub
   unlocked-io update-copyright utimensat
   warnings year2038
diff --git a/lib/file-has-acl.c b/lib/file-has-acl.c
index 26d3e358de7..3269d7f71b7 100644
--- a/lib/file-has-acl.c
+++ b/lib/file-has-acl.c
@@ -145,7 +145,7 @@ aclinfo_has_xattr (struct aclinfo const *ai, char const *xattr)
   if (0 < ai->size)
     {
       char const *blim = ai->buf + ai->size;
-      for (char const *b = ai->buf; b < blim; b += strlen (b) + 1)
+      for (char const *b = ai->buf; b < blim; b = strnul (b) + 1)
         for (char const *a = xattr; *a == *b; a++, b++)
           if (!*a)
             return true;
diff --git a/lib/gnulib.mk.in b/lib/gnulib.mk.in
index 053d234a474..824931caf90 100644
--- a/lib/gnulib.mk.in
+++ b/lib/gnulib.mk.in
@@ -140,6 +140,7 @@
 #  lstat \
 #  malloc-gnu \
 #  manywarnings \
+#  memeq \
 #  memmem-simple \
 #  mempcpy \
 #  memrchr \
@@ -172,7 +173,7 @@
 #  stdio-h \
 #  stdio-windows \
 #  stpcpy \
-#  stringeq \
+#  streq \
 #  strnlen \
 #  strtoimax \
 #  symlink \
@@ -537,6 +538,7 @@ GL_GNULIB_MDA_UMASK = @GL_GNULIB_MDA_UMASK@
 GL_GNULIB_MDA_UNLINK = @GL_GNULIB_MDA_UNLINK@
 GL_GNULIB_MDA_WRITE = @GL_GNULIB_MDA_WRITE@
 GL_GNULIB_MEMCHR = @GL_GNULIB_MEMCHR@
+GL_GNULIB_MEMEQ = @GL_GNULIB_MEMEQ@
 GL_GNULIB_MEMMEM = @GL_GNULIB_MEMMEM@
 GL_GNULIB_MEMPCPY = @GL_GNULIB_MEMPCPY@
 GL_GNULIB_MEMRCHR = @GL_GNULIB_MEMRCHR@
@@ -626,12 +628,12 @@ GL_GNULIB_STPNCPY = @GL_GNULIB_STPNCPY@
 GL_GNULIB_STRCASESTR = @GL_GNULIB_STRCASESTR@
 GL_GNULIB_STRCHRNUL = @GL_GNULIB_STRCHRNUL@
 GL_GNULIB_STRDUP = @GL_GNULIB_STRDUP@
+GL_GNULIB_STREQ = @GL_GNULIB_STREQ@
 GL_GNULIB_STRERROR = @GL_GNULIB_STRERROR@
 GL_GNULIB_STRERRORNAME_NP = @GL_GNULIB_STRERRORNAME_NP@
 GL_GNULIB_STRERROR_L = @GL_GNULIB_STRERROR_L@
 GL_GNULIB_STRERROR_R = @GL_GNULIB_STRERROR_R@
 GL_GNULIB_STRFTIME = @GL_GNULIB_STRFTIME@
-GL_GNULIB_STRINGEQ = @GL_GNULIB_STRINGEQ@
 GL_GNULIB_STRNCAT = @GL_GNULIB_STRNCAT@
 GL_GNULIB_STRNCPY = @GL_GNULIB_STRNCPY@
 GL_GNULIB_STRNDUP = @GL_GNULIB_STRNDUP@
@@ -2790,6 +2792,14 @@ EXTRA_libgnu_a_SOURCES += malloc.c
 endif
 ## end   gnulib module malloc-posix
 
+## begin gnulib module memeq
+ifeq (,$(OMIT_GNULIB_MODULE_memeq))
+
+libgnu_a_SOURCES += memeq.c
+
+endif
+## end   gnulib module memeq
+
 ## begin gnulib module memmem-simple
 ifeq (,$(OMIT_GNULIB_MODULE_memmem-simple))
 
@@ -3729,6 +3739,14 @@ endif
 endif
 ## end   gnulib module stpcpy
 
+## begin gnulib module streq
+ifeq (,$(OMIT_GNULIB_MODULE_streq))
+
+libgnu_a_SOURCES += streq.c
+
+endif
+## end   gnulib module streq
+
 ## begin gnulib module string-h
 ifeq (,$(OMIT_GNULIB_MODULE_string-h))
 
@@ -3763,6 +3781,7 @@ string.h: string.in.h $(top_builddir)/config.status $(CXXDEFS_H) $(ARG_NONNULL_H
 	      -e 's/@''GNULIB_MBS_ENDSWITH''@/$(GL_GNULIB_MBS_ENDSWITH)/g' \
 	      -e 's/@''GNULIB_MBS_STARTSWITH''@/$(GL_GNULIB_MBS_STARTSWITH)/g' \
 	      -e 's/@''GNULIB_MEMCHR''@/$(GL_GNULIB_MEMCHR)/g' \
+	      -e 's/@''GNULIB_MEMEQ''@/$(GL_GNULIB_MEMEQ)/g' \
 	      -e 's/@''GNULIB_MEMMEM''@/$(GL_GNULIB_MEMMEM)/g' \
 	      -e 's/@''GNULIB_MEMPCPY''@/$(GL_GNULIB_MEMPCPY)/g' \
 	      -e 's/@''GNULIB_MEMRCHR''@/$(GL_GNULIB_MEMRCHR)/g' \
@@ -3772,7 +3791,7 @@ string.h: string.in.h $(top_builddir)/config.status $(CXXDEFS_H) $(ARG_NONNULL_H
 	      -e 's/@''GNULIB_STPNCPY''@/$(GL_GNULIB_STPNCPY)/g' \
 	      -e 's/@''GNULIB_STRCHRNUL''@/$(GL_GNULIB_STRCHRNUL)/g' \
 	      -e 's/@''GNULIB_STRDUP''@/$(GL_GNULIB_STRDUP)/g' \
-	      -e 's/@''GNULIB_STRINGEQ''@/$(GL_GNULIB_STRINGEQ)/g' \
+	      -e 's/@''GNULIB_STREQ''@/$(GL_GNULIB_STREQ)/g' \
 	      -e 's/@''GNULIB_STRNCAT''@/$(GL_GNULIB_STRNCAT)/g' \
 	      -e 's/@''GNULIB_STRNCPY''@/$(GL_GNULIB_STRNCPY)/g' \
 	      -e 's/@''GNULIB_STRNDUP''@/$(GL_GNULIB_STRNDUP)/g' \
@@ -3863,14 +3882,6 @@ EXTRA_DIST += string.in.h
 endif
 ## end   gnulib module string-h
 
-## begin gnulib module stringeq
-ifeq (,$(OMIT_GNULIB_MODULE_stringeq))
-
-libgnu_a_SOURCES += string.c
-
-endif
-## end   gnulib module stringeq
-
 ## begin gnulib module strnlen
 ifeq (,$(OMIT_GNULIB_MODULE_strnlen))
 
@@ -3881,6 +3892,14 @@ endif
 endif
 ## end   gnulib module strnlen
 
+## begin gnulib module strnul
+ifeq (,$(OMIT_GNULIB_MODULE_strnul))
+
+libgnu_a_SOURCES += strnul.c
+
+endif
+## end   gnulib module strnul
+
 ## begin gnulib module strtoimax
 ifeq (,$(OMIT_GNULIB_MODULE_strtoimax))
 
diff --git a/lib/string.c b/lib/memeq.c
similarity index 90%
rename from lib/string.c
rename to lib/memeq.c
index b8f079aa78f..9cefacd9495 100644
--- a/lib/string.c
+++ b/lib/memeq.c
@@ -1,4 +1,4 @@
-/* streq, memeq, gl_strnul functions.
+/* memeq function.
    Copyright (C) 2025-2026 Free Software Foundation, Inc.
 
    This file is free software: you can redistribute it and/or modify
@@ -14,6 +14,6 @@
    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
-#define _GL_STRING_INLINE _GL_EXTERN_INLINE
+#define _GL_MEMEQ_INLINE _GL_EXTERN_INLINE
 #include <config.h>
 #include <string.h>
diff --git a/lib/sha3.c b/lib/sha3.c
index 1bebbc76950..e7cb5ab5494 100644
--- a/lib/sha3.c
+++ b/lib/sha3.c
@@ -378,7 +378,7 @@ sha3_read_ctx (struct sha3_ctx const *restrict ctx, void *restrict resbuf)
     {
       if (EVP_MD_CTX_copy_ex (evp_ctx, ctx->evp_ctx))
         {
-          if (EVP_DigestFinal_ex (evp_ctx, resbuf, 0))
+          if (EVP_DigestFinal_ex (evp_ctx, resbuf, NULL))
             result = resbuf;
           err = EINVAL;
         }
diff --git a/lib/streq.c b/lib/streq.c
new file mode 100644
index 00000000000..69b0d7b7843
--- /dev/null
+++ b/lib/streq.c
@@ -0,0 +1,19 @@
+/* streq function.
+   Copyright (C) 2025-2026 Free Software Foundation, Inc.
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   This file is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+#define _GL_STREQ_INLINE _GL_EXTERN_INLINE
+#include <config.h>
+#include <string.h>
diff --git a/lib/strftime.c b/lib/strftime.c
index 8d32023729c..f7cf65d5413 100644
--- a/lib/strftime.c
+++ b/lib/strftime.c
@@ -888,6 +888,7 @@ static CHAR_T const c_month_names[][sizeof "September"] =
     L_("June"), L_("July"), L_("August"), L_("September"), L_("October"),
     L_("November"), L_("December")
   };
+static CHAR_T const c_ampm_letters[] = { L_('A'), L_('M'), L_('P'), L_('M') };
 #endif
 
 
@@ -1274,7 +1275,7 @@ __strftime_internal (STREAM_OR_CHAR_T *s, STRFTIME_ARG (size_t maxsize)
 # define f_month \
   (tp->tm_mon < 0 || tp->tm_mon > 11 ? L_("?") : c_month_names[tp->tm_mon])
 /* The English AM/PM strings happen to have the same length, namely 2.  */
-# define ampm (L_("AMPM") + 2 * (tp->tm_hour > 11))
+# define ampm (c_ampm_letters + 2 * (12 <= tp->tm_hour))
 # define ap_len 2
 #endif
   retval_t i = 0;
@@ -1358,7 +1359,7 @@ __strftime_internal (STREAM_OR_CHAR_T *s, STRFTIME_ARG (size_t maxsize)
             mbstate_t mbstate = mbstate_zero;
 
             if (! format_end)
-              format_end = f + strlen (f) + 1;
+              format_end = strnul (f) + 1;
             size_t fsize = format_end - f;
 
             size_t len = 0;
diff --git a/lib/string.in.h b/lib/string.in.h
index 599203c44db..0cd83c7844f 100644
--- a/lib/string.in.h
+++ b/lib/string.in.h
@@ -81,9 +81,14 @@
 #endif
 
 _GL_INLINE_HEADER_BEGIN
-
-#ifndef _GL_STRING_INLINE
-# define _GL_STRING_INLINE _GL_INLINE
+#ifndef _GL_MEMEQ_INLINE
+# define _GL_MEMEQ_INLINE _GL_INLINE
+#endif
+#ifndef _GL_STREQ_INLINE
+# define _GL_STREQ_INLINE _GL_INLINE
+#endif
+#ifndef _GL_STRNUL_INLINE
+# define _GL_STRNUL_INLINE _GL_INLINE
 #endif
 
 /* _GL_ATTRIBUTE_DEALLOC (F, I) declares that the function returns pointers
@@ -414,11 +419,11 @@ _GL_WARN_ON_USE_CXX (memchr,
 #endif
 
 /* Are S1 and S2, of size N, bytewise equal?  */
-#if @GNULIB_STRINGEQ@ && !@HAVE_DECL_MEMEQ@
+#if @GNULIB_MEMEQ@ && !@HAVE_DECL_MEMEQ@
 # ifdef __cplusplus
 extern "C" {
 # endif
-_GL_STRING_INLINE bool
+_GL_MEMEQ_INLINE bool
 memeq (void const *__s1, void const *__s2, size_t __n)
 {
   return !memcmp (__s1, __s2, __n);
@@ -799,11 +804,11 @@ _GL_CXXALIASWARN (strdup);
 #endif
 
 /* Are strings S1 and S2 equal?  */
-#if @GNULIB_STRINGEQ@ && !@HAVE_DECL_STREQ@
+#if @GNULIB_STREQ@ && !@HAVE_DECL_STREQ@
 # ifdef __cplusplus
 extern "C" {
 # endif
-_GL_STRING_INLINE bool
+_GL_STREQ_INLINE bool
 streq (char const *__s1, char const *__s2)
 {
   return !strcmp (__s1, __s2);
@@ -1243,10 +1248,10 @@ _GL_WARN_ON_USE (strtok_r, "strtok_r is unportable - "
 # ifdef __cplusplus
 extern "C" {
 # endif
-_GL_STRING_INLINE const char *gl_strnul (const char *string)
+_GL_STRNUL_INLINE const char *gl_strnul (const char *string)
      _GL_ATTRIBUTE_PURE
      _GL_ARG_NONNULL ((1));
-_GL_STRING_INLINE const char *gl_strnul (const char *string)
+_GL_STRNUL_INLINE const char *gl_strnul (const char *string)
 {
   /* In gcc >= 7 or clang >= 4, we could use the expression
        strchr (string, '\0')
@@ -1260,21 +1265,29 @@ _GL_STRING_INLINE const char *gl_strnul (const char *string)
 }
 # endif
 # ifdef __cplusplus
+_GL_BEGIN_NAMESPACE
 template <typename T> T strnul (T);
 template <> inline const char *strnul<const char *> (const char *s)
 { return gl_strnul (s); }
 template <> inline       char *strnul<      char *> (      char *s)
 { return const_cast<char *>(gl_strnul (s)); }
+_GL_END_NAMESPACE
 # else
 #  if (defined __GNUC__ && __GNUC__ + (__GNUC_MINOR__ >= 9) > 4 && !defined __cplusplus) \
       || (defined __clang__ && __clang_major__ >= 3) \
       || (defined __SUNPRO_C && __SUNPRO_C >= 0x5150) \
       || (__STDC_VERSION__ >= 201112L && !defined __GNUC__)
 /* The compiler supports _Generic from ISO C11.  */
+/* Since in C (but not in C++!), any function that accepts a '[const] char *'
+   also accepts a '[const] void *' as argument, we make sure that the function-
+   like macro does the same, by mapping its type first:
+     char *, void *             -> void *
+     const char *, const void * -> const void *
+   This mapping is done through the conditional expression.  */
 #   define strnul(s) \
-      _Generic (s, \
-                char *       : (char *) gl_strnul (s), \
-                const char * : gl_strnul (s))
+      _Generic (1 ? (s) : (void *) 99, \
+                void *       : (char *) gl_strnul (s), \
+                const void * : gl_strnul (s))
 #  else
 #   define strnul(s) \
       ((char *) gl_strnul (s))
@@ -1609,8 +1622,6 @@ _GL_EXTERN_C char * mbstok_r (char *restrict string, const char *delim,
 _GL_EXTERN_C bool mbs_startswith (const char *string, const char *prefix)
      _GL_ATTRIBUTE_PURE
      _GL_ARG_NONNULL ((1, 2));
-/* No extra code is needed for multibyte locales for this function.  */
-# define mbs_startswith str_startswith
 #endif
 
 #if @GNULIB_MBS_ENDSWITH@
diff --git a/lib/strnul.c b/lib/strnul.c
new file mode 100644
index 00000000000..a567f0722ec
--- /dev/null
+++ b/lib/strnul.c
@@ -0,0 +1,19 @@
+/* gl_strnul function.
+   Copyright (C) 2025-2026 Free Software Foundation, Inc.
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   This file is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+#define _GL_STRNUL_INLINE _GL_EXTERN_INLINE
+#include <config.h>
+#include <string.h>
diff --git a/lib/time_rz.c b/lib/time_rz.c
index 811240e6da1..0e8ea47e791 100644
--- a/lib/time_rz.c
+++ b/lib/time_rz.c
@@ -146,7 +146,7 @@ save_abbr (timezone_t tz, struct tm *tm)
               break;
             }
 
-          zone_copy += strlen (zone_copy) + 1;
+          zone_copy = strnul (zone_copy) + 1;
           if (!*zone_copy && tz->next)
             {
               tz = tz->next;
diff --git a/m4/gnulib-comp.m4 b/m4/gnulib-comp.m4
index 984f657e2ed..54fbf912efe 100644
--- a/m4/gnulib-comp.m4
+++ b/m4/gnulib-comp.m4
@@ -146,6 +146,7 @@ AC_DEFUN([gl_EARLY],
   # Code from module malloc-gnu:
   # Code from module malloc-posix:
   # Code from module manywarnings:
+  # Code from module memeq:
   # Code from module memmem-simple:
   # Code from module mempcpy:
   # Code from module memrchr:
@@ -196,9 +197,10 @@ AC_DEFUN([gl_EARLY],
   # Code from module stdio-windows:
   # Code from module stdlib-h:
   # Code from module stpcpy:
+  # Code from module streq:
   # Code from module string-h:
-  # Code from module stringeq:
   # Code from module strnlen:
+  # Code from module strnul:
   # Code from module strtoimax:
   # Code from module strtoll:
   # Code from module symlink:
@@ -446,6 +448,8 @@ AC_DEFUN([gl_INIT],
     AC_LIBOBJ([malloc])
   fi
   gl_STDLIB_MODULE_INDICATOR([malloc-posix])
+  gl_FUNC_MEMEQ
+  gl_STRING_MODULE_INDICATOR([memeq])
   gl_FUNC_MEMMEM_SIMPLE
   if test $HAVE_MEMMEM = 0 || test $REPLACE_MEMMEM = 1; then
     AC_LIBOBJ([memmem])
@@ -621,12 +625,11 @@ AC_DEFUN([gl_INIT],
     gl_PREREQ_STPCPY
   ])
   gl_STRING_MODULE_INDICATOR([stpcpy])
+  gl_FUNC_STREQ
+  gl_STRING_MODULE_INDICATOR([streq])
   gl_STRING_H
   gl_STRING_H_REQUIRE_DEFAULTS
   AC_PROG_MKDIR_P
-  gl_FUNC_STREQ
-  gl_FUNC_MEMEQ
-  gl_STRING_MODULE_INDICATOR([stringeq])
   gl_FUNC_STRNLEN
   gl_CONDITIONAL([GL_COND_OBJ_STRNLEN],
                  [test $HAVE_DECL_STRNLEN = 0 || test $REPLACE_STRNLEN = 1])
@@ -634,6 +637,7 @@ AC_DEFUN([gl_INIT],
     gl_PREREQ_STRNLEN
   ])
   gl_STRING_MODULE_INDICATOR([strnlen])
+  gl_STRING_MODULE_INDICATOR([strnul])
   gl_FUNC_STRTOIMAX
   gl_CONDITIONAL([GL_COND_OBJ_STRTOIMAX],
                  [test $HAVE_DECL_STRTOIMAX = 0 || test $REPLACE_STRTOIMAX = 1])
@@ -1405,6 +1409,7 @@ AC_DEFUN([gl_FILE_LIST], [
   lib/md5-stream.c
   lib/md5.c
   lib/md5.h
+  lib/memeq.c
   lib/memmem.c
   lib/mempcpy.c
   lib/memrchr.c
@@ -1476,11 +1481,12 @@ AC_DEFUN([gl_FILE_LIST], [
   lib/stdlib.in.h
   lib/stpcpy.c
   lib/str-two-way.h
+  lib/streq.c
   lib/strftime.c
   lib/strftime.h
-  lib/string.c
   lib/string.in.h
   lib/strnlen.c
+  lib/strnul.c
   lib/strtoimax.c
   lib/strtol.c
   lib/strtoll.c
@@ -1581,6 +1587,7 @@ AC_DEFUN([gl_FILE_LIST], [
   m4/manywarnings.m4
   m4/mbstate_t.m4
   m4/md5.m4
+  m4/memeq.m4
   m4/memmem.m4
   m4/mempcpy.m4
   m4/memrchr.m4
@@ -1631,8 +1638,8 @@ AC_DEFUN([gl_FILE_LIST], [
   m4/stdio_h.m4
   m4/stdlib_h.m4
   m4/stpcpy.m4
+  m4/streq.m4
   m4/string_h.m4
-  m4/stringeq.m4
   m4/strnlen.m4
   m4/strtoimax.m4
   m4/strtoll.m4
diff --git a/m4/stringeq.m4 b/m4/memeq.m4
similarity index 72%
rename from m4/stringeq.m4
rename to m4/memeq.m4
index ffea8afc7ee..775c1bdb74d 100644
--- a/m4/stringeq.m4
+++ b/m4/memeq.m4
@@ -1,4 +1,4 @@
-# stringeq.m4
+# memeq.m4
 # serial 1
 dnl Copyright (C) 2025-2026 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
@@ -6,15 +6,6 @@ dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
 dnl This file is offered as-is, without any warranty.
 
-AC_DEFUN([gl_FUNC_STREQ],
-[
-  AC_REQUIRE([gl_STRING_H_DEFAULTS])
-  AC_CHECK_DECLS_ONCE([streq])
-  if test $ac_cv_have_decl_streq != no; then
-    HAVE_DECL_STREQ=1
-  fi
-])
-
 AC_DEFUN([gl_FUNC_MEMEQ],
 [
   AC_REQUIRE([gl_STRING_H_DEFAULTS])
diff --git a/m4/streq.m4 b/m4/streq.m4
new file mode 100644
index 00000000000..58c24fdc145
--- /dev/null
+++ b/m4/streq.m4
@@ -0,0 +1,16 @@
+# streq.m4
+# serial 1
+dnl Copyright (C) 2025-2026 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+dnl This file is offered as-is, without any warranty.
+
+AC_DEFUN([gl_FUNC_STREQ],
+[
+  AC_REQUIRE([gl_STRING_H_DEFAULTS])
+  AC_CHECK_DECLS_ONCE([streq])
+  if test $ac_cv_have_decl_streq != no; then
+    HAVE_DECL_STREQ=1
+  fi
+])
diff --git a/m4/string_h.m4 b/m4/string_h.m4
index 93a5d354cf9..86f9537ef14 100644
--- a/m4/string_h.m4
+++ b/m4/string_h.m4
@@ -1,5 +1,5 @@
 # string_h.m4
-# serial 47
+# serial 48
 dnl Copyright (C) 2007-2026 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -54,6 +54,7 @@ AC_DEFUN([gl_STRING_H_REQUIRE_DEFAULTS],
     gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FFSL])
     gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_FFSLL])
     gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MEMCHR])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MEMEQ])
     gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MEMMEM])
     gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MEMPCPY])
     gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MEMRCHR])
@@ -63,7 +64,7 @@ AC_DEFUN([gl_STRING_H_REQUIRE_DEFAULTS],
     gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STPNCPY])
     gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRCHRNUL])
     gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRDUP])
-    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRINGEQ])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STREQ])
     gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRNCAT])
     gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRNCPY])
     gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRNDUP])