diff --git a/configure b/configure
index f5d7352..f4ee310 100755
--- a/configure
+++ b/configure
@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.in Revision: 71261 .
+# From configure.in Revision: 71274 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.61 for python 3.1.
 #
@@ -21603,12 +21603,455 @@
 fi
 
 
-# ************************************
-# * Check for mathematical functions *
-# ************************************
+# **************************************************
+# * Check for various properties of floating point *
+# **************************************************
 
-LIBS_SAVE=$LIBS
-LIBS="$LIBS $LIBM"
+{ echo "$as_me:$LINENO: checking whether C doubles are little-endian IEEE 754 binary64" >&5
+echo $ECHO_N "checking whether C doubles are little-endian IEEE 754 binary64... $ECHO_C" >&6; }
+if test "${ac_cv_little_endian_double+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+
+if test "$cross_compiling" = yes; then
+  ac_cv_little_endian_double=no
+else
+  cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+#include <string.h>
+int main() {
+    double x = 9006104071832581.0;
+    if (memcmp(&x, "\x05\x04\x03\x02\x01\xff\x3f\x43", 8) == 0)
+        return 0;
+    else
+        return 1;
+}
+
+_ACEOF
+rm -f conftest$ac_exeext
+if { (ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_link") 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && { ac_try='./conftest$ac_exeext'
+  { (case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_try") 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_cv_little_endian_double=yes
+else
+  echo "$as_me: program exited with status $ac_status" >&5
+echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+( exit $ac_status )
+ac_cv_little_endian_double=no
+fi
+rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext conftest.$ac_objext conftest.$ac_ext
+fi
+
+
+fi
+
+{ echo "$as_me:$LINENO: result: $ac_cv_little_endian_double" >&5
+echo "${ECHO_T}$ac_cv_little_endian_double" >&6; }
+if test "$ac_cv_little_endian_double" = yes
+then
+
+cat >>confdefs.h <<\_ACEOF
+#define DOUBLE_IS_LITTLE_ENDIAN_IEEE754 1
+_ACEOF
+
+fi
+
+{ echo "$as_me:$LINENO: checking whether C doubles are big-endian IEEE 754 binary64" >&5
+echo $ECHO_N "checking whether C doubles are big-endian IEEE 754 binary64... $ECHO_C" >&6; }
+if test "${ac_cv_big_endian_double+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+
+if test "$cross_compiling" = yes; then
+  ac_cv_big_endian_double=no
+else
+  cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+#include <string.h>
+int main() {
+    double x = 9006104071832581.0;
+    if (memcmp(&x, "\x43\x3f\xff\x01\x02\x03\x04\x05", 8) == 0)
+        return 0;
+    else
+        return 1;
+}
+
+_ACEOF
+rm -f conftest$ac_exeext
+if { (ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_link") 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && { ac_try='./conftest$ac_exeext'
+  { (case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_try") 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_cv_big_endian_double=yes
+else
+  echo "$as_me: program exited with status $ac_status" >&5
+echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+( exit $ac_status )
+ac_cv_big_endian_double=no
+fi
+rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext conftest.$ac_objext conftest.$ac_ext
+fi
+
+
+fi
+
+{ echo "$as_me:$LINENO: result: $ac_cv_big_endian_double" >&5
+echo "${ECHO_T}$ac_cv_big_endian_double" >&6; }
+if test "$ac_cv_big_endian_double" = yes
+then
+
+cat >>confdefs.h <<\_ACEOF
+#define DOUBLE_IS_BIG_ENDIAN_IEEE754 1
+_ACEOF
+
+fi
+
+# Some ARM platforms use a mixed-endian representation for doubles.
+# While Python doesn't currently have full support for these platforms
+# (see e.g., issue 1762561), we can at least make sure that float <-> string
+# conversions work.
+{ echo "$as_me:$LINENO: checking whether C doubles are ARM mixed-endian IEEE 754 binary64" >&5
+echo $ECHO_N "checking whether C doubles are ARM mixed-endian IEEE 754 binary64... $ECHO_C" >&6; }
+if test "${ac_cv_mixed_endian_double+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+
+if test "$cross_compiling" = yes; then
+  ac_cv_mixed_endian_double=no
+else
+  cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+#include <string.h>
+int main() {
+    double x = 9006104071832581.0;
+    if (memcmp(&x, "\x01\xff\x3f\x43\x05\x04\x03\x02", 8) == 0)
+        return 0;
+    else
+        return 1;
+}
+
+_ACEOF
+rm -f conftest$ac_exeext
+if { (ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_link") 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && { ac_try='./conftest$ac_exeext'
+  { (case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_try") 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_cv_mixed_endian_double=yes
+else
+  echo "$as_me: program exited with status $ac_status" >&5
+echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+( exit $ac_status )
+ac_cv_mixed_endian_double=no
+fi
+rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext conftest.$ac_objext conftest.$ac_ext
+fi
+
+
+fi
+
+{ echo "$as_me:$LINENO: result: $ac_cv_mixed_endian_double" >&5
+echo "${ECHO_T}$ac_cv_mixed_endian_double" >&6; }
+if test "$ac_cv_mixed_endian_double" = yes
+then
+
+cat >>confdefs.h <<\_ACEOF
+#define DOUBLE_IS_ARM_MIXED_ENDIAN_IEEE754 1
+_ACEOF
+
+fi
+
+# David Gay's code in Python/dtoa.c requires that the FPU uses 53-bit
+# rounding; this is a particular problem on x86, where the x87 FPU has
+# a default rounding precision of 64 bits.  For gcc/x86, we try to fix
+# this by:
+#
+#   (1) using the SSE2 instruction set when available (it usually is
+#       on modern machines)
+#   (2) using inline assembler to get and set the x87 FPU control word
+#       otherwise.
+#
+# On AMD64 (aka x86-64), gcc automatically enables use of SSE2
+# instructions, so we don't bother trying to detect.
+
+if test "$GCC" = yes && test -n "`$CC -dM -E - </dev/null | grep i386`"
+then
+    # determine whether we're already using the SSE2 instruction set for math
+    # (e.g., this is true by default on OS X/x86)
+    { echo "$as_me:$LINENO: checking whether SSE2 instructions are already enabled for math" >&5
+echo $ECHO_N "checking whether SSE2 instructions are already enabled for math... $ECHO_C" >&6; }
+    if test -n "`$CC -dM -E - </dev/null | grep __SSE2_MATH__`"
+    then
+        ac_sse2_enabled=yes
+    else
+        ac_sse2_enabled=no
+    fi
+    { echo "$as_me:$LINENO: result: $ac_sse2_enabled" >&5
+echo "${ECHO_T}$ac_sse2_enabled" >&6; }
+
+    # if we're not using SSE2 already, we need to either enable it
+    # (when available), or use inline assembler to get and set the
+    # 387 control word.
+    if test $ac_sse2_enabled = no
+    then
+        # Check cpuid for SSE2 availability.  Bits 25 and 26 of edx tell
+        # us about SSE and SSE2 respectively.
+        { echo "$as_me:$LINENO: checking whether SSE2 instructions are available on this CPU" >&5
+echo $ECHO_N "checking whether SSE2 instructions are available on this CPU... $ECHO_C" >&6; }
+        if test "$cross_compiling" = yes; then
+  ac_cv_cpu_has_sse2=no
+else
+  cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+            int main() {
+                unsigned int ax, bx, cx, dx, func;
+                func = 1U;
+                __asm__ __volatile__ (
+                    "pushl %%ebx\n\t"  /* don't clobber ebx */
+                    "cpuid\n\t"
+                    "movl %%ebx, %1\n\t"
+                    "popl %%ebx"
+                    : "=a" (ax), "=r" (bx), "=c" (cx), "=d" (dx)
+                    : "a" (func)
+                    : "cc" );
+                if ((dx & (1U << 25)) && (dx & (1U << 26)))
+                    return 0;
+                else
+                    return 1;
+            }
+
+_ACEOF
+rm -f conftest$ac_exeext
+if { (ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_link") 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && { ac_try='./conftest$ac_exeext'
+  { (case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_try") 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_cv_cpu_has_sse2=yes
+else
+  echo "$as_me: program exited with status $ac_status" >&5
+echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+( exit $ac_status )
+ac_cv_cpu_has_sse2=no
+fi
+rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext conftest.$ac_objext conftest.$ac_ext
+fi
+
+
+        { echo "$as_me:$LINENO: result: $ac_cv_cpu_has_sse2" >&5
+echo "${ECHO_T}$ac_cv_cpu_has_sse2" >&6; }
+
+        # determine whether gcc accepts options to turn on SSE2
+        { echo "$as_me:$LINENO: checking whether $CC accepts -msse2 -mfpmath=sse" >&5
+echo $ECHO_N "checking whether $CC accepts -msse2 -mfpmath=sse... $ECHO_C" >&6; }
+        ac_save_cc="$CC"
+        CC="$CC -msse2 -mfpmath=sse"
+        if test "$cross_compiling" = yes; then
+  ac_cv_msse2_ok=no
+else
+  cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+int main() { return 0; }
+_ACEOF
+rm -f conftest$ac_exeext
+if { (ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_link") 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && { ac_try='./conftest$ac_exeext'
+  { (case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_try") 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_cv_msse2_ok=yes
+else
+  echo "$as_me: program exited with status $ac_status" >&5
+echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+( exit $ac_status )
+ac_cv_msse2_ok=no
+fi
+rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext conftest.$ac_objext conftest.$ac_ext
+fi
+
+
+        CC="$ac_save_cc"
+        { echo "$as_me:$LINENO: result: $ac_cv_msse2_ok" >&5
+echo "${ECHO_T}$ac_cv_msse2_ok" >&6; }
+
+        if test $ac_cv_cpu_has_sse2 = yes && test $ac_cv_msse2_ok = yes
+        then
+            BASECFLAGS="$BASECFLAGS -msse2 -mfpmath=sse"
+        else
+            # SSE2 doesn't appear to be available.  Check that it's okay
+            # to use gcc inline assembler to get and set x87 control word
+
+cat >>confdefs.h <<\_ACEOF
+#define USING_X87_FPU 1
+_ACEOF
+
+            { echo "$as_me:$LINENO: checking whether we can use gcc inline assembler to get and set x87 control word" >&5
+echo $ECHO_N "checking whether we can use gcc inline assembler to get and set x87 control word... $ECHO_C" >&6; }
+            cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+int
+main ()
+{
+
+              unsigned short cw;
+              __asm__ __volatile__ ("fnstcw %0" : "=m" (cw));
+              __asm__ __volatile__ ("fldcw %0" : : "m" (cw));
+
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext
+if { (ac_try="$ac_compile"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_compile") 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && {
+	 test -z "$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       } && test -s conftest.$ac_objext; then
+  have_gcc_asm_for_x87=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+	have_gcc_asm_for_x87=no
+fi
+
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+            { echo "$as_me:$LINENO: result: $have_gcc_asm_for_x87" >&5
+echo "${ECHO_T}$have_gcc_asm_for_x87" >&6; }
+            if test "$have_gcc_asm_for_x87" = yes
+            then
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_GCC_ASM_FOR_X87 1
+_ACEOF
+
+            fi
+        fi
+    fi
+fi
 
 # Detect whether system arithmetic is subject to x87-style double
 # rounding issues.  The result of this test has little meaning on non
@@ -21617,10 +22060,9 @@
 # 0 otherwise.  See http://bugs.python.org/issue2937 for more info.
 { echo "$as_me:$LINENO: checking for x87-style double rounding" >&5
 echo $ECHO_N "checking for x87-style double rounding... $ECHO_C" >&6; }
-if test "${ac_cv_x87_double_rounding+set}" = set; then
-  echo $ECHO_N "(cached) $ECHO_C" >&6
-else
-
+# $BASECFLAGS may affect the result
+ac_save_cc="$CC"
+CC="$CC $BASECFLAGS"
 if test "$cross_compiling" = yes; then
   ac_cv_x87_double_rounding=no
 else
@@ -21684,8 +22126,7 @@
 fi
 
 
-fi
-
+CC="$ac_save_cc"
 { echo "$as_me:$LINENO: result: $ac_cv_x87_double_rounding" >&5
 echo "${ECHO_T}$ac_cv_x87_double_rounding" >&6; }
 if test "$ac_cv_x87_double_rounding" = yes
@@ -21697,6 +22138,13 @@
 
 fi
 
+# ************************************
+# * Check for mathematical functions *
+# ************************************
+
+LIBS_SAVE=$LIBS
+LIBS="$LIBS $LIBM"
+
 # Multiprocessing check for broken sem_getvalue
 { echo "$as_me:$LINENO: checking for broken sem_getvalue" >&5
 echo $ECHO_N "checking for broken sem_getvalue... $ECHO_C" >&6; }