Limits on comp time for exempt employees

Q. One of my managers had to work on a holiday, and the hourly employee who worked with him got double time in addition to the holiday pay. When the salaried employee wanted to take time off shortly afterward, my boss said it was not legal to give him comp time—he would have to be paid for the holiday he worked. The employee would rather have time off. Is there no comp time for anyone? —J.W., North Carolina