More explanation of some configure options documented somewhere?

I was reading through the ./configure –help options but would like to know more details about some of them listed. Is there a more detailed document that tells about them? If not, can someone explain what these do?

Code:
./configure --help
...
--enable-optimizations  enable optimization (default is yes)
--enable-profiling      enable gprof profiling (default is no)
--enable-texturepacker  enable texturepacker support (default is auto)
...