--- pgp/src/randpool.c	2018/04/24 16:42:20	1.1.1.2
+++ pgp/src/randpool.c	2018/04/24 16:43:39	1.1.1.3
@@ -30,7 +30,8 @@
 /* The pool must be a multiple of the 16-byte (128-bit) MD5 block size */
 #define RANDPOOLWORDS ((RANDPOOLBITS+127 & ~127) >> 5)
 #if RANDPOOLWORDS <= 16
-#error Random pool too small - please increase RANDPOOLBITS in randpool.h
+/* #error is not portable, this has the same effect */
+#include "Random pool too small - please increase RANDPOOLBITS in randpool.h"
 #endif
 
 /* Must be word-aligned, so make it words.  Cast to bytes as needed. */
@@ -42,7 +43,7 @@ static void
 xorbytes(byte *dest, byte const *src, unsigned len)
 {
 	while (len--)
-		*dest++ = *src++;
+		*dest++ ^= *src++;
 }
 
 /*