diff -r 10ecf8576eb2 Modules/selectmodule.c
--- a/Modules/selectmodule.c	Tue Jun 21 17:24:21 2011 +0200
+++ b/Modules/selectmodule.c	Wed Jun 22 18:56:12 2011 +0200
@@ -1196,24 +1196,26 @@
 
 #if (SIZEOF_UINTPTR_T != SIZEOF_VOID_P)
 #   error uintptr_t does not match void *!
+/* OpenBSD's struct kevent definition differs from other BSD operating systems:
+ * ident and data members are u_int and int respectively. */
+#elif ((SIZEOF_UINTPTR_T == SIZEOF_INT) || defined(__OpenBSD__))
+#   define T_UINTPTRT         T_UINT
+#   define T_INTPTRT          T_INT
+#   define PyLong_AsUintptr_t PyLong_AsUnsignedLong
+#   define UINTPTRT_FMT_UNIT  "I"
+#   define INTPTRT_FMT_UNIT   "i"
+#elif (SIZEOF_UINTPTR_T == SIZEOF_LONG)
+#   define T_UINTPTRT         T_ULONG
+#   define T_INTPTRT          T_LONG
+#   define PyLong_AsUintptr_t PyLong_AsUnsignedLong
+#   define UINTPTRT_FMT_UNIT  "k"
+#   define INTPTRT_FMT_UNIT   "l"
 #elif (SIZEOF_UINTPTR_T == SIZEOF_LONG_LONG)
 #   define T_UINTPTRT         T_ULONGLONG
 #   define T_INTPTRT          T_LONGLONG
 #   define PyLong_AsUintptr_t PyLong_AsUnsignedLongLong
 #   define UINTPTRT_FMT_UNIT  "K"
 #   define INTPTRT_FMT_UNIT   "L"
-#elif (SIZEOF_UINTPTR_T == SIZEOF_LONG)
-#   define T_UINTPTRT         T_ULONG
-#   define T_INTPTRT          T_LONG
-#   define PyLong_AsUintptr_t PyLong_AsUnsignedLong
-#   define UINTPTRT_FMT_UNIT  "k"
-#   define INTPTRT_FMT_UNIT   "l"
-#elif (SIZEOF_UINTPTR_T == SIZEOF_INT)
-#   define T_UINTPTRT         T_UINT
-#   define T_INTPTRT          T_INT
-#   define PyLong_AsUintptr_t PyLong_AsUnsignedLong
-#   define UINTPTRT_FMT_UNIT  "I"
-#   define INTPTRT_FMT_UNIT   "i"
 #else
 #   error uintptr_t does not match int, long, or long long!
 #endif