./configure --help "--enable-debug=no && --disable-debug=no"?

[Steven T. Hatton]

This message didn't show up on my end the first time I sent it.
This is from the ./configure of KDevelop:

  --enable-debug=ARG      enables debug symbols (yes|no|full) default=no
  --disable-debug         disables debug output and debug symbols default=no

What does it mean?  It seems to say the debug symbols are both enabled and 
disabled.
-- 
Regards,
Steven