... preprocessed output to 'c_fib3.ppo'... Lines 5038, Functions/Procedures 1 Generating C source output to 'c_fib3.c'... Done. Microsoft (R) C/C++ Optimizing Compiler Version 19.29.30038.1 for x64 Copyright (C) Microsoft Corporation. All rights reserved. c_fib3.c c_fib3.obj : error LNK2019: unresolved ...