installing KDE3 next to KDE2

I'm trying to install KDE3 next to KDE2 following the instructions on
the page "How to get KDE2 and KDE3 (from cvs) working on the same
machine". At a certain point in the explanation I read I should install
autoconf 2.52 in the kde3 dir,  which directory is meant here?
/home/kde3 or /usr/local/kde3

How should I install it? like this?
tar xvfj autoconf-2.52.tar.bz2
cd autoconf-2.52
./configure
make
make install

should I leave out the make install?

I'm also in doubt for the following:
You also have to create the .cvsrc file for the kde3 user:

                                  [kde3@localhost kde3]$ vi .cvsrc

                                  and add the 4 lines given previously
(diff -u....).
                                  Logout as kde3, login as root.

which 4 lines are meant here?


all help welcome

best regards