mutt_system (cmd);
if (mutt_system (cmd) == -1) { mutt_error (_("Error running \"%s\"!"), cmd); rc = -1; } else rc = 0;
int mutt_do_pager (const char *banner,		   const char *tempfile,		   int do_color,		   pager_t *info){  int rc;    if (!Pager || mutt_strcmp (Pager, "builtin") == 0)    rc = mutt_pager (banner, tempfile, do_color, info);  else  {    char cmd[STRING];        endwin ();    mutt_expand_file_fmt (cmd, sizeof(cmd), Pager, tempfile);    mutt_system (cmd);    mutt_unlink (tempfile);    rc = 0;  }  return rc;}