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diff --git a/gl/m4/strsep.m4 b/gl/m4/strsep.m4
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+# strsep.m4 serial 11
+dnl Copyright (C) 2002-2004, 2007, 2009-2023 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.
+
+AC_DEFUN([gl_FUNC_STRSEP],
+[
+  dnl Persuade glibc <string.h> to declare strsep().
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
+  dnl The strsep() declaration in lib/string.in.h uses 'restrict'.
+  AC_REQUIRE([AC_C_RESTRICT])
+
+  AC_REQUIRE([gl_STRING_H_DEFAULTS])
+  AC_CHECK_FUNCS([strsep])
+  if test $ac_cv_func_strsep = no; then
+    HAVE_STRSEP=0
+  fi
+])
+
+# Prerequisites of lib/strsep.c.
+AC_DEFUN([gl_PREREQ_STRSEP], [:])