Merge alpha100 branch back to main trunk
diff --git a/Modules/md5.h b/Modules/md5.h
index 5c01861..29ac540 100644
--- a/Modules/md5.h
+++ b/Modules/md5.h
@@ -32,6 +32,9 @@
 The following makes PROTOTYPES default to 0 if it has not already
   been defined with C compiler flags.
  */
+#ifdef HAVE_PROTOTYPES
+#define PROTOTYPES 1
+#endif
 #ifndef PROTOTYPES
 #define PROTOTYPES 0
 #endif