work/source: In function ‘int main(int, char**)’:
work/source:14:30: error: ‘fopen’ was not declared in this scope
work/source:15:23: error: ‘fscanf’ was not declared in this scope
work/source:18:13: error: ‘fclose’ was not declared in this scope
work/source:67:36: error: ‘fprintf’ was not declared in this scope
