gistfile1.txt

# In earlier versions of this makefile, the other two directories were
# subdirectories of $(TZDIR).  However, this led to configuration errors.
# For example, with posix_right under the earlier scheme,  
# TZ='right/Australia/Adelaide' got you localtime with leap seconds,
# but gmtime without leap seconds, which led to problems with applications
# like sendmail that subtract gmtime from localtime.       
# Therefore, the other two directories are now siblings of $(TZDIR).
# You must replace all of $(TZDIR) to switch from not using leap seconds
# to using them, or vice versa.