Update

src/examples/echo.c

+#include <stdio.h>
+#include <syscall.h>
+
+int
+main (int argc, char **argv)
+{
+  int i;
+
+  for (i = 0; i < argc; i++)
+    printf ("%s ", argv[i]);
+  printf ("\n");
+
+  return EXIT_SUCCESS;
+}