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diff --git a/m4/jm-glibc-io.m4n b/m4/jm-glibc-io.m4n
new file mode 100644
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+++ b/m4/jm-glibc-io.m4n
@@ -0,0 +1,33 @@
+#serial 5 -*- autoconf -*-
+
+dnl From Jim Meyering.
+dnl
+dnl See if the glibc *_unlocked I/O macros are available.
+dnl Use only those *_unlocked macros that are declared.
+dnl
+
+AC_DEFUN(jm_FUNC_GLIBC_UNLOCKED_IO,
+  [
+    # Kludge (not executed) to make autoheader do the right thing.
+    if test a = b; then
+      AC_CHECK_DECLS([@comma_separated@])
+      AC_CHECK_FUNCS(@space_separated@)
+    fi
+
+    io_functions='@space_separated@'
+
+    for jm_io_func in $io_functions; do
+      # Check for the existence of each function only if it is declared.
+      # Otherwise, we'd get the Solaris5.5.1 functions that are not
+      # declared, and that have been removed from Solaris5.6.  The resulting
+      # 5.5.1 binaries would not run on 5.6 due to shared library differences.
+      AC_CHECK_DECLS([$jm_io_func],
+		     jm_declared=yes,
+		     jm_declared=no,
+		     [#include <stdio.h>])
+      if test $jm_declared = yes; then
+        AC_CHECK_FUNCS($jm_io_func)
+      fi
+    done
+  ]
+)