[Scribus] parellel install

[Peter Lesterhuis]

Hi,
I have scribus 1.2.5 installed on my fc5 system. Now I want to do a 
parallel install of scribus 1.3.3.4
I followed instructions from http://docs.scribus.net. I created a dir 
"home/peter/scribus", untarred the tarrball and issued the 
./configure-command ( ./configure --prefix=/home/peter/scribus).
Now I get this error:

...
checking for X... configure: error: Can't find X includes. Please check 
your installation and add the correct paths!

What does this mean? Do I have to make alterations in my PATH? In PATH I 
have the default settings of fc5.
Thanks in advance.
Peter.