[Clfs-support] Mesa-7.1 compiling: /usr/bin/ld: cannot find -lX11 ?

[xg du]

I got this messgage when compiling the MesaLib-7.1 and MesaGlUT-7.1 :

----------------------------------------
/bin/sh ../../../bin/mklib -o glut -linker 'gcc -m64' -ldflags '' \
        -major 3 -minor 7 -patch 1 \
         -install ../../../lib64 \
        -id /usr/lib64/libglut.3.dylib \
        -L../../../lib64 -lGLU -lGL  -lX11 -lXmu -lXi -lm glut_8x13.o
glut_9x15.o glut_bitmap.o glut_bwidth.o glut_cindex.o glut_cmap.o
glut_cursor.o glut_dials.o glut_dstr.o glut_event.o glut_ext.o glut_fcb.o
glut_fullscrn.o glut_gamemode.o glut_get.o glut_glxext.o glut_hel10.o
glut_hel12.o glut_hel18.o glut_init.o glut_input.o glut_joy.o glut_key.o
glut_keyctrl.o glut_keyup.o glut_menu.o glut_menu2.o glut_mesa.o
glut_modifier.o glut_mroman.o glut_overlay.o glut_roman.o glut_shapes.o
glut_space.o glut_stroke.o glut_swap.o glut_swidth.o glut_tablet.o
glut_teapot.o glut_tr10.o glut_tr24.o glut_util.o glut_vidresize.o
glut_warp.o glut_win.o glut_winmisc.o layerutil.o
mklib: Making Linux shared library:  libglut.so.3.7.1
/usr/bin/ld: cannot find -lX11
collect2: ld returned 1 exit status
mklib: Installing libglut.so.3.7.1 libglut.so.3 libglut.so in ../../../lib64
mv: cannot stat `libglut.so.3.7.1': No such file or directory
make[2]: *** [../../../lib64/libglut.so] Error 1
make[2]: Leaving directory `/sources/xorg-20081125/Mesa-7.1-64/src/glut/glx'
make[1]: *** [subdirs] Error 1
make[1]: Leaving directory `/sources/xorg-20081125/Mesa-7.1-64/src'
make: *** [default] Error 1
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XORG_PREFIX=/usr/X11R7
the value of PKG_CONFIG_PATH64 and XORG_CONFIG64 is setted up according the
cblfs.

the  /etc/ld.so.conf contains:
 /usr/lib
/usr/lib64
/usr/X11R7/lib64
/usr/X11R7/lib32

Is there anything  I should add to this file ?
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