[snapshot 20041022] Shared object "libX11.so.6" not found

$ cat libraries/BuildFFI
[...]
cd /udd/f/fool/hugs98-20041022
[...]
echo 'Compiling hugsdir/packages/X11/Graphics/X11/Xlib/Atom.hs'
src/ffihugs +G -98 -Phugsdir/packages/X11: +L-Ihugsdir/packages/X11/Graphics/X11/Xlib +L-Ifptools/libraries/X11/include +L-L/usr/X11R6/lib +L-I/usr/X11R6/include +L-lX11 Graphics.X11.Xlib.Atom
[...]
$ ls -l /usr/X11R6/lib/libX11.so.6
lrwxr-xr-x  1 root  wheel  13 Feb 27  2003 /usr/X11R6/lib/libX11.so.6 -> libX11.so.6.1
$ ls -l /usr/X11R6/lib/libX11.so.6.1
-r-xr-xr-x  1 root  wheel  1117472 Feb 27  2003 /usr/X11R6/lib/libX11.so.6.1
$ file /usr/X11R6/lib/libX11.so.6.1
/usr/X11R6/lib/libX11.so.6.1: ELF 64-bit LSB shared object, Alpha (unofficial), version 1 (SYSV), not stripped
$ make
[...]
cd ..; env HUGSDIR=hugsdir HUGSFLAGS='' libraries/BuildFFI
[...]
Compiling hugsdir/packages/X11/Graphics/X11/Xlib/Atom.hs
runhugs: Error occurred
ERROR "hugsdir/packages/X11/Graphics/X11/Xlib/Atom.hs" - Error while importing DLL "/udd/f/fool/hugs98-20041022/hugsdir/packages/X11/Graphics/X11/Xlib/Atom.so":
Shared object "libX11.so.6" not found



[... some errors omitted ...]
make[1]: *** [../hugsdir/libraries/Hugs/Storable.so] Error 1
make[1]: Leaving directory `/udd/f/fool/hugs98-20041022/libraries'
make: *** [all] Error 2
$