mem* functions are declared in string.h.

crypto/ec/ec_asn1.c

@@ -53,6 +53,7 @@
  *
  */
 
+#include <string.h>
 #include "ec_lcl.h"
 #include <openssl/err.h>
 #include <openssl/asn1t.h>

crypto/ec/ec_key.c

@@ -61,6 +61,7 @@
  * contributed to the OpenSSL project.
  */
 
+#include <string.h>
 #include "ec_lcl.h"
 #include <openssl/err.h>
 #include <string.h>

crypto/ecdsa/ecs_lib.c

@@ -53,6 +53,7 @@
  *
  */
 
+#include <string.h>
 #include "ecdsa.h"
 #include <openssl/engine.h>