--- a/src/prelude-lml.c	
+++ a/src/prelude-lml.c	
@@ -37,6 +37,7 @@ 
 #include <sys/select.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
+#include "ltdl.h"
 
 #if TIME_WITH_SYS_TIME
 # include <sys/time.h>