Fix

Author: Flying-dragon-boxing

source/module_cell/klist.h

@@ -308,7 +308,8 @@ class K_Vectors
      * @return this->ik2iktot[ik]
      */
     void cal_ik_global();
-
+#ifdef __MPI
     friend void KVectorUtils::kvec_mpi_k(K_Vectors& kvec);
+#endif
 };
 #endif // KVECT_H