./configure error on Mandrake 10.1

[Comminot Pascal (EDU)]

Hello,

I'm trying to compile ddd (ddd-3.3.10) on Mandrake 10.1.
When I'm running ./configure, I receive the following error message:

 
... 
checking for X... no 
checking whether libXext is in the standard X library path... no 
checking whether libXp is in the standard X library path... no 
checking whether libXmu is in the standard X library path... no 
checking for Motif... libraries /usr/X11R6/lib, headers (none) 
checking for Xpm... libraries /usr/X11R6/lib, headers (none) 
checking for Athena... libraries /usr/X11R6/lib, headers (none) 
checking whether compiling X headers requires -fpermissive... no 
checking for XOpenDisplay in -lX11... no 
 
configure: error: 
The X11 library '-lX11' could not be found. 
Please use the configure options '--x-includes=DIR' 
and '--x-libraries=DIR' to specify the X location. 
See the files 'config.log' and 'ddd/config.log' 
for further diagnostics. 
 
Where can I find the requested information (I'm a newbie)?

Thanks in advance 

Pascal