Yes, some parts of the amd64 user space are missing in
the Bell Labs distribution. You have you apply these patches:

hget http://9legacy.org/9legacy/patch/amd64.diff | ape/patch -p0
hget http://9legacy.org/9legacy/patch/amd64-fix.diff | ape/patch -p0

Also, you have to create the sub-directories in /amd64/bin.

You can take a look to my notes available here:

http://9legacy.org/9legacy/doc/nix/usage