/* overwrite the sum in the bin file, with the actual */
lseek (ifd, SHA1_SUM_POS, SEEK_END);
if (write (ifd, output, SHA1_SUM_LEN) != SHA1_SUM_LEN) {
/* overwrite the sum in the bin file, with the actual */
lseek (ifd, SHA1_SUM_POS, SEEK_END);
if (write (ifd, output, SHA1_SUM_LEN) != SHA1_SUM_LEN) {