[Scribus] Error during configure 1.3.3.8

[Pier Luigi Cinquantini]

During configure I received this error:

>>>>>

[root at localhost scribus-1.3.3.8]# ./configure --prefix=/opt/scribus/
...
checking for crt_externs.h... no
checking for _NSGetEnviron... no
checking for vsnprintf... yes
checking for snprintf... yes
checking for X... configure: error: Can't find X includes. Please check your 
installation and add the correct paths!
<<<<<<

What have I do to be able to install it?

I have Mandriva 2007 on my PC.

Thanks,
Pier Luigi Cinquantini