Copy Sun-specific inclusion of <alloca.h> from 2.7 maint to trunk; it seems to not have been merged to py3k.

birkenfeld · birkenfeld · commit ca9400f05192 · 2010-07-31T09:37:03.000Z
diff --git a/Modules/_ctypes/ctypes.h b/Modules/_ctypes/ctypes.h
@@ -1,3 +1,7 @@
+#if defined (__SVR4) && defined (__sun)
+#   include <alloca.h>
+#endif
+
 #ifndef MS_WIN32
 #define max(a, b) ((a) > (b) ? (a) : (b))
 #define min(a, b) ((a) < (b) ? (a) : (b))
