workaround for OpenBSD compiler bug w.r.t. handling of overflows.
diff --git a/Include/pyport.h b/Include/pyport.h
index 8747271..085833f 100644
--- a/Include/pyport.h
+++ b/Include/pyport.h
@@ -257,8 +257,17 @@
* in non-overflow cases.
* X is evaluated more than once.
* Some platforms have better way to spell this, so expect some #ifdef'ery.
+ *
+ * OpenBSD uses 'isinf()' because a compiler bug on that platform causes
+ * the longer macro version to be mis-compiled. This isn't optimal, and
+ * should be removed once a newer compiler is available on that platform.
+ * The system that had the failure was running OpenBSD 3.2 on Intel, with
+ * gcc 2.95.3.
+ *
+ * According to Tim's checkin, the FreeBSD systems use isinf() to work
+ * around a FPE bug on that platform.
*/
-#ifdef __FreeBSD__
+#if defined(__FreeBSD__) || defined(__OpenBSD__)
#define Py_OVERFLOWED(X) isinf(X)
#else
#define Py_OVERFLOWED(X) ((X) != 0.0 && (errno == ERANGE || \