remove distributions before installworld?

[N Deepak]

Hi,

  I have installed FreeBSD 5.3-RELEASE through CD-ROM.

  I used cvsup to sync my /usr/src directory to the latest STABLE tree.

  The problem is that I had installed some distributions that I no
  longer want to keep.  Also, I don't need lpr (this can be disabled
  through make.conf).  So, is there a way to remove these files, before
  I do 'make installworld'?

  I did not find any information on this in the handbook.

Thanks,
Deepak