diff --git a/configure b/configure
index 5858af6..a7b976a 100755
--- a/configure
+++ b/configure
@@ -8347,6 +8347,39 @@
 _ACEOF
 
 
+# The cast to long int works around a bug in the HP C Compiler
+# version HP92453-01 B.11.11.23709.GP, which incorrectly rejects
+# declarations like `int a3[[(sizeof (unsigned char)) >= 0]];'.
+# This bug is HP SR number 8606223364.
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking size of uintptr_t" >&5
+$as_echo_n "checking size of uintptr_t... " >&6; }
+if ${ac_cv_sizeof_uintptr_t+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if ac_fn_c_compute_int "$LINENO" "(long int) (sizeof (uintptr_t))" "ac_cv_sizeof_uintptr_t"        "$ac_includes_default"; then :
+
+else
+  if test "$ac_cv_type_uintptr_t" = yes; then
+     { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+as_fn_error 77 "cannot compute sizeof (uintptr_t)
+See \`config.log' for more details" "$LINENO" 5; }
+   else
+     ac_cv_sizeof_uintptr_t=0
+   fi
+fi
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_sizeof_uintptr_t" >&5
+$as_echo "$ac_cv_sizeof_uintptr_t" >&6; }
+
+
+
+cat >>confdefs.h <<_ACEOF
+#define SIZEOF_UINTPTR_T $ac_cv_sizeof_uintptr_t
+_ACEOF
+
+
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for long double support" >&5
 $as_echo_n "checking for long double support... " >&6; }
diff --git a/configure.ac b/configure.ac
index 9358f0a..b4c7016 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2077,6 +2077,7 @@
 AC_CHECK_SIZEOF(fpos_t, 4)
 AC_CHECK_SIZEOF(size_t, 4)
 AC_CHECK_SIZEOF(pid_t, 4)
+AC_CHECK_SIZEOF(uintptr_t)
 
 AC_MSG_CHECKING(for long double support)
 have_long_double=no
diff --git a/pyconfig.h.in b/pyconfig.h.in
index a7c12bf..ed6b80d 100644
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -1308,6 +1308,9 @@
 /* The size of `time_t', as computed by sizeof. */
 #undef SIZEOF_TIME_T
 
+/* The size of `uintptr_t', as computed by sizeof. */
+#undef SIZEOF_UINTPTR_T
+
 /* The size of `void *', as computed by sizeof. */
 #undef SIZEOF_VOID_P