diff -Naur Python-3.8.2.orig/Modules/_blake2/impl/blake2-impl.h Python-3.8.2/Modules/_blake2/impl/blake2-impl.h
--- Python-3.8.2.orig/Modules/_blake2/impl/blake2-impl.h	2020-04-12 01:20:03.000000000 +0200
+++ Python-3.8.2/Modules/_blake2/impl/blake2-impl.h	2020-04-12 01:21:11.000000000 +0200
@@ -26,6 +26,8 @@
 #define BLAKE2_IMPL_EVAL(x,y)  BLAKE2_IMPL_CAT(x,y)
 #define BLAKE2_IMPL_NAME(fun)  BLAKE2_IMPL_EVAL(fun, SUFFIX)
 
+#undef HAVE_EXPLICIT_BZERO
+#undef HAVE_EXPLICIT_MEMSET
 static inline uint32_t load32( const void *src )
 {
 #if defined(NATIVE_LITTLE_ENDIAN)