[EMBOSS] Install error (AMD64)

[Kerti Balazs Gabor]

Hello!

I would like to install emboss (latest version) from source. The host OS 
is Fedora Linux Core 4 (2.6.11-1.1369_FC4 #1 Thu Jun 2 22:56:33 EDT 2005 
x86_64 x86_64 x86_64 GNU/Linux).
The script
$ configure --enable 64
ran clear but the
make
made error this:

/bin/sh ../libtool --tag=CC --mode=link gcc  -O2   -o aaindexextract 
aaindexextract.o ../nucleus/libnucleus.la ../ajax/libajaxg.la 
../ajax/libajax.la ../plplot/libplplot.la -lX11  -lm
mkdir .libs
gcc -O2 -o .libs/aaindexextract aaindexextract.o 
../nucleus/.libs/libnucleus.so ../ajax/.libs/libajaxg.so 
../ajax/.libs/libajax.so ../plplot/.libs/libplplot.so -lX11 -lm 
-Wl,--rpath -Wl,/usr/local/lib
/usr/bin/ld: cannot find -lX11
collect2: ld returned 1 exit status
make[2]: *** [aaindexextract] Error 1
make[2]: Leaving directory `/usr/src/EMBOSS-2.10.0/emboss'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/usr/src/EMBOSS-2.10.0/emboss'
make: *** [all-recursive] Error 1
[root at localhost EMBOSS-2.10.0]#

How to solve this? What package(s) need for it?

Balazs