install or update a software in a server

I work in a server and uses the gnuplot for making figures. I found the gnuplot does not work well with some new functions.

First I tried to find out the version of gnuplot in the server.
1) which gnuplot
/usr/bin/gnuplot
2) /usr/bin/gnuplot --version
4.0
 this is an old version and I want to install the new version. Therefore I go to sourceforge http://sourceforge.net/projects/gnuplot/files/gnuplot/4.4.0/ to download the version 4.4,
and put the downloaded file in a temporary directory in my home in the server. Then I tried to install it in the server !

3) To build it:
     ./configure --PREFIX=$HOME/software
Because I do not have permission to install software in/usr/local, I use --PREFIX=$HOME/software  to install it in this path.
     make
6) test it
     make check
7) install it
     make install

8) finally I add an alias in the .bashrc and .tcshrc (and the .tcshrc_profile)
alias gnuplot4="/home/username/software/bin/gnuplot"
add in the .tcshrc (and the .tcshrc_profile)
alias   gnuplot4    home/username/software/bin/gnuplot
I also add the GNUPLOT_PS_DIR in the tcshrc and bashrc.
set GNUPLOT_PS_DIR = /home/username/software/

9) when I try to call a gnuplot program,
gnuplot4    histogram.plt