Main branch fails to compile on x86_64.

[Jean-Philippe Bernardy]

Trying to build hugs CVS version on x86_64 yields:

jp at legolas:~/haskell/fptools/hugs98$ make
cd src; make all
make[1]: Entering directory `/home/jp/haskell/fptools/hugs98/src'
gcc  hugs.o edit.o observe.o builtin.o char.o compiler.o errors.o
evaluator.o ffi.o goal.o input.o machdep.o machine.o module.o opts.o
output.o plugin.o script.o static.o storage.o strutil.o subst.o type.o
version.o  -lreadline -lncurses -lm -ldl  -o hugs
builtin.o: In function `mkThunk':
/home/jp/haskell/fptools/hugs98/src/builtin.c:2044: undefined
reference to `mallocBytesRWX'
collect2: ld returned 1 exit status
make[1]: *** [hugs] Error 1
make[1]: Leaving directory `/home/jp/haskell/fptools/hugs98/src'
make: *** [all] Error 2
jp at legolas:~/haskell/fptools/hugs98$ uname -a
Linux legolas 2.6.12-10-amd64-generic #1 Mon Feb 13 12:14:05 UTC 2006
x86_64 GNU/Linux
jp at legolas:~/haskell/fptools/hugs98$

Cheers,
JP.