How do I report a Roth IRA rollover made within 60 days that spans two tax years, i.e., money withdrawn in Dec 2018 and contributed to same account in Feb 2019?

I am 47 years old.  I withdrew money from my Roth IRA in December 2018 to make a downpayment on a construction loan for a custom home.  The money withdrawn included my full contribution basis, plus some earnings.  I instructed the Trustee not to withhold tax.  I intend to rollover the full amount of the funds withdrawn to the same Roth IRA within 60 days.