How to use DFly sources via nfs?

[walt]

Matthew Dillon wrote:

    I recommend simply making /usr/src a directory and doing the mount
    directly on /usr/src.  You can allow subdirectories to be mounted
    by using the -alldirs option in /etc/exports.  So, for example,
    the server can export /usr read-only:
    /usr -ro -alldirs -maproot=root: ...

    And then on the client you can do:

    mount server:/usr/src /usr/src
Okay, that worked fine.  I have the correct files mounted ro on /usr/src
but when I cd /usr/src and 'make obj' it hangs forever, doing nothing.
# ps axl
0   722   719   5 168   0   460  316 sbwait DL+   p2    0:00.00 make obj
The process is unkillable.  Any ideas what's going on?

Has anyone else got this working properly?