Wrap <stdint.h> in #ifdef HAVE_STDINT_H.
diff --git a/xmss_hash_address.c b/xmss_hash_address.c
index 385868d..0ff4fdb 100644
--- a/xmss_hash_address.c
+++ b/xmss_hash_address.c
@@ -6,7 +6,9 @@
 */
 #include "includes.h"
 
+#ifdef HAVE_STDINT_H
 #include <stdint.h>
+#endif
 #include "xmss_hash_address.h"	/* prototypes */
 
 void setLayerADRS(uint32_t adrs[8], uint32_t layer){