initialized before calling begin_job. The removes an assignment
of Output_file from mpgen which was used to solve the same problem.
Here we are solving it for all of the codegens.
/* N_pages = pages.x * pages.y; */
/* Cur_page = 0; */
- Output_file = ofp;
fprintf(Output_file, "%%--- graphviz MetaPost input\n");
fprintf(Output_file, "%% Created by program: %s version %s (%s)\n",
info[0], info[1], info[2]);