Error when cross-compiling ruby for amd64

[Helge H. <hel...@ai...>]

I've used ruby for i386 successfully.  But I've got an opteron
now, so I want to compile a 64-bit kernel.  I followed debian's
guide for setting up cross-compiling, but the compile itself
ended like this:

In file included from arch/x86_64/ia32/ia32_ioctl.c:19:
fs/compat_ioctl.c: In function `do_fontx_ioctl':
fs/compat_ioctl.c:1616: error: `cfdarg' undeclared (first use in this function)
fs/compat_ioctl.c:1616: error: (Each undeclared identifier is reported only 
once
fs/compat_ioctl.c:1616: error: for each function it appears in.)
In file included from arch/x86_64/ia32/ia32_ioctl.c:19:
fs/compat_ioctl.c: In function `do_kdfontop_ioctl':
fs/compat_ioctl.c:1655: warning: unused variable `vt'
make[1]: *** [arch/x86_64/ia32/ia32_ioctl.o] Error 1
make: *** [arch/x86_64/ia32] Error 2


I need to have 32-bit emulation so I can switch to a 64-bit
kernel first and change over userspace gradually as the next step.

Any ideas?  
Or is 2.6.9 "too old" now?

Helge Hafting