Donr declate AUTH as a struct in libnfs.h

make it include rpc/auth.h properly instead

include/libnfs.h

@@ -18,6 +18,7 @@
  * This is the highlevel interface to access NFS resources using a posix-like interface
  */
 #include <stdint.h>
+#include <rpc/auth.h>
 
 struct nfs_context;
 struct rpc_context;
@@ -62,7 +63,6 @@ EXTERN int nfs_queue_length(struct nfs_context *nfs);
 /*
  * Used if you need different credentials than the default for the current user.
  */
-struct AUTH;
 EXTERN void nfs_set_auth(struct nfs_context *nfs, struct AUTH *auth);