+# Check whether --enable-weak-symbols or --disable-weak-symbols was given.
+if test "${enable_weak_symbols+set}" = set; then
+ enableval="$enable_weak_symbols"
+ use_weak_symbols=$withval
+else
+ use_weak_symbols=no
+fi;
+echo "$as_me:9315: result: $use_weak_symbols" >&5
+echo "${ECHO_T}$use_weak_symbols" >&6
+if test "$use_weak_symbols" = yes ; then
+
+echo "$as_me:9319: checking if $CC supports weak symbols" >&5
+echo $ECHO_N "checking if $CC supports weak symbols... $ECHO_C" >&6
+if test "${cf_cv_weak_symbols+set}" = set; then
+ echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+
+cat >conftest.$ac_ext <<_ACEOF
+#line 9326 "configure"
+#include "confdefs.h"
+
+#include <stdio.h>
+int
+main ()
+{
+
+#if defined(__GNUC__)
+# if defined __USE_ISOC99
+# define _cat_pragma(exp) _Pragma(#exp)
+# define _weak_pragma(exp) _cat_pragma(weak name)
+# else
+# define _weak_pragma(exp)
+# endif
+# define _declare(name) __extension__ extern __typeof__(name) name
+# define weak_symbol(name) _weak_pragma(name) _declare(name) __attribute__((weak))
+#endif
+
+weak_symbol(fopen);
+
+ ;
+ return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext
+if { (eval echo "$as_me:9352: \"$ac_compile\"") >&5
+ (eval $ac_compile) 2>&5
+ ac_status=$?
+ echo "$as_me:9355: \$? = $ac_status" >&5
+ (exit $ac_status); } &&
+ { ac_try='test -s conftest.$ac_objext'
+ { (eval echo "$as_me:9358: \"$ac_try\"") >&5
+ (eval $ac_try) 2>&5
+ ac_status=$?
+ echo "$as_me:9361: \$? = $ac_status" >&5
+ (exit $ac_status); }; }; then
+ cf_cv_weak_symbols=yes
+else
+ echo "$as_me: failed program was:" >&5
+cat conftest.$ac_ext >&5
+cf_cv_weak_symbols=no
+fi
+rm -f conftest.$ac_objext conftest.$ac_ext
+
+fi
+echo "$as_me:9372: result: $cf_cv_weak_symbols" >&5
+echo "${ECHO_T}$cf_cv_weak_symbols" >&6
+
+else
+ cf_cv_weak_symbols=no
+fi
+
+if test $cf_cv_weak_symbols = yes ; then
+ cat >>confdefs.h <<\EOF
+#define USE_WEAK_SYMBOLS 1
+EOF
+
+fi
+
+PTHREAD=