md4.c: In function 'MD4_Update':
[15:57:53] md4.c:197:5: error: implicit declaration of function 'Curl_memdup' [-Werror=implicit-function-declaration]
[15:57:53]      ctx->data = Curl_memdup(data, size);
[15:57:53]      ^
[15:57:53] md4.c:197:15: warning: assignment makes pointer from integer without a cast [enabled by default]
[15:57:53]      ctx->data = Curl_memdup(data, size);
[15:57:53]                ^
[15:57:53] cc1: some warnings being treated as errors
[15:57:53] make[2]: *** [Makefile:2733: libcurl_la-md4.lo] Error 1
[15:57:53] make[2]: *** Waiting for unfinished jobs....

--- a/lib/md4.c
+++ b/lib/md4.c
@@ -23,6 +23,7 @@
  ***************************************************************************/
 
 #include "curl_setup.h"
+#include "strdup.h"
 
 #if defined(USE_CURL_NTLM_CORE)