diff --git a/configure b/configure
index 50a44ed..fa81592 100755
--- a/configure
+++ b/configure
@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.in Revision: 82963 .
+# From configure.in Revision: 84367 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.65 for python 3.1.
 #
@@ -9410,6 +9410,7 @@
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for flock" >&5
 $as_echo_n "checking for flock... " >&6; }
+have_flock=no
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
@@ -9426,16 +9427,89 @@
 _ACEOF
 if ac_fn_c_try_compile "$LINENO"; then :
 
+
 $as_echo "#define HAVE_FLOCK 1" >>confdefs.h
 
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
-$as_echo "yes" >&6; }
-else
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
-$as_echo "no" >&6; }
+  have_flock=yes
 
 fi
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $have_flock" >&5
+$as_echo "$have_flock" >&6; }
+
+if test "$have_flock" = yes ; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking if flock requires additional libraries." >&5
+$as_echo_n "checking if flock requires additional libraries.... " >&6; }
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+  #include "confdefs.h"
+  #include <sys/file.h>
+
+int
+main ()
+{
+flock(0, 0)
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+else
+
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for flock in -lbsd" >&5
+$as_echo_n "checking for flock in -lbsd... " >&6; }
+if test "${ac_cv_lib_bsd_flock+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lbsd  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char flock ();
+int
+main ()
+{
+return flock ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_bsd_flock=yes
+else
+  ac_cv_lib_bsd_flock=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_bsd_flock" >&5
+$as_echo "$ac_cv_lib_bsd_flock" >&6; }
+if test "x$ac_cv_lib_bsd_flock" = x""yes; then :
+
+
+$as_echo "#define FLOCK_NEEDS_LIBBSD 1" >>confdefs.h
+
+
+fi
+
+
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+fi
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for getpagesize" >&5
 $as_echo_n "checking for getpagesize... " >&6; }