[ns] Installing ns-2.33 on Suse

[FERLIN,Simone]

Hi,
I am trying to install *ns-2.33 on Suse* distribution and get the following
error:

/usr/lib64/gcc-lib/x86_64-suse-linux/3.3.5/../../../../x86_64-suse-linux/bin/ld:
skipping incompatible /usr/X11R6/lib/libXext.so when searching for -lXext
/usr/lib64/gcc-lib/x86_64-suse-linux/3.3.5/../../../../x86_64-suse-linux/bin/ld:
skipping incompatible /usr/X11R6/lib/libXext.a when searching for -lXext
/usr/lib64/gcc-lib/x86_64-suse-linux/3.3.5/../../../../x86_64-suse-linux/bin/ld:
cannot find -lXext
collect2: ld returned 1 exit status
make: *** [ns] Error 1
Ns make failed!

would anybody help with it?

thanks,
sisiferl