ACCT_VERSION
#if ACCT_VERSION == 1 || ACCT_VERSION == 2
#elif ACCT_VERSION == 3
ac->ac_version = ACCT_VERSION | ACCT_BYTEORDER;
#if ACCT_VERSION == 3
#if ACCT_VERSION == 1 || ACCT_VERSION == 2
#if ACCT_VERSION == 2
#if ACCT_VERSION == 1 || ACCT_VERSION == 2
#elif ACCT_VERSION == 3