mkstemps was added in GLIBC-2.11 (http://sourceware.org/git/?p=glibc.git;a=commitdiff;h=3a83202db6e5591f2b72974c1ad98602c6620770)
Pretend not to have it (even on systems with GLIBC >= 2.11) and use the bundled version of it instead in order to avoid the dependency on GLIBC-2.11

--- libiberty/configure
+++ libiberty/configure
@@ -4016,7 +4016,7 @@
 funcs="$funcs memmove"
 funcs="$funcs mempcpy"
 funcs="$funcs memset"
-funcs="$funcs mkstemps"
+funcs="$funcs mkstemps"; ac_cv_func_mkstemps=no
 funcs="$funcs putenv"
 funcs="$funcs random"
 funcs="$funcs rename"
--- libiberty/make-temp-file.c
+++ libiberty/make-temp-file.c
@@ -43,7 +43,7 @@
 #endif
 
 #include "libiberty.h"
-extern int mkstemps PARAMS ((char *, int));
+extern int mkstemps_libiberty PARAMS ((char *, int));
 
 /* '/' works just fine on MS-DOS based systems.  */
 #ifndef DIR_SEPARATOR
@@ -167,7 +167,7 @@
   strcpy (temp_filename + base_len, TEMP_FILE);
   strcpy (temp_filename + base_len + TEMP_FILE_LEN, suffix);
 
-  fd = mkstemps (temp_filename, suffix_len);
+  fd = mkstemps_libiberty (temp_filename, suffix_len);
   /* If mkstemps failed, then something bad is happening.  Maybe we should
      issue a message about a possible security attack in progress?  */
   if (fd == -1)
--- libiberty/mkstemps.c
+++ libiberty/mkstemps.c
@@ -51,7 +51,7 @@
 
 /*
 
-@deftypefn Replacement int mkstemps (char *@var{template}, int @var{suffix_len})
+@deftypefn Replacement int mkstemps_libiberty (char *@var{template}, int @var{suffix_len})
 
 Generate a unique temporary file name from @var{template}.
 @var{template} has the form:
@@ -71,7 +71,7 @@
 */
 
 int
-mkstemps (template, suffix_len)
+mkstemps_libiberty (template, suffix_len)
      char *template;
      int suffix_len;
 {