TiBook w/-current semi-comatose building boost-libs

["John D. Baker" <jdbaker%consolidated.net@localhost>]

After a long hiatus, I managed to excavate my last working PowerMac,
a TiBook 667MHz system.  It's been updated to 9.99.73 as of sometime
last week and I've been updating packages with 'pkg_rolling-replace'.

In case it's relevant, it runs NetBSD as a diskless system (local disk
still has MacOS X 10.4.11).

All has been working very well--much more stable than I remember from
my past experiences.

Except, when it tries to build "devel/boost-libs".  It gets as far as:

[...]
Component configuration:

    - atomic                   : building
    - chrono                   : building
    - container                : building
    - context                  : building
    - contract                 : building
    - coroutine                : building
    - date_time                : building
    - exception                : building
    - fiber                    : building
    - filesystem               : building
    - graph                    : building
    - graph_parallel           : building
    - headers                  : building
    - iostreams                : building
    - locale                   : building
    - log                      : building
    - math                     : building
    - mpi                      : building
    - nowide                   : building
    - program_options          : building
    - python                   : not building
    - random                   : building
    - regex                    : building
    - serialization            : building
    - stacktrace               : building
    - system                   : building
    - test                     : building
    - thread                   : building
    - timer                    : building
    - type_erasure             : building
    - wave                     : building

...patience...
...patience...
...patience...
...patience...
...patience...
...patience...
[stuck]

and there it sits, in perpetuity.  In past attempts there was no keyboard
response but on this most recent one occasionally poking the spacebar
followed by backspace seemed to indicate things were working (this is
via an SSH session).

I had started X on the laptop screen so the screenblanker would keep it
dark.  At the point it gets stuck, no keyboard/trackpad activity will
unblank the screen.  An attempt to initiate an additional SSH session
hangs (it doesn't time out but it doesn't progress either).

So far, the only way I can regain control is to reboot with Ctrl-Cmd-Power.

Ideas?

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