When I try to cross-build build NetBSD/vax on an i386, I get:

  /usr/build60/tools/bin/vax--netbsdelf-gcc   -o atexit -nostdlib  -Wl,-rpath-link,/usr/build60/destdir/lib:/usr/build60/destdir/usr/lib  -L/usr/build60/destdir/lib /usr/build60/destdir/usr/lib/crt0.o /usr/build60/destdir/usr/lib/crti.o /usr/build60/destdir/usr/lib/crtbegin.o atexit.o -lpthread -L/usr/build60/destdir/usr/lib -L/usr/build60/destdir/usr/lib  -lgcc -lc -lgcc /usr/build60/destdir/usr/lib/crtend.o /usr/build60/destdir/usr/lib/crtn.o
  /usr/build60/destdir/usr/lib/libpthread.so: undefined reference to `PT_SLEEPUC'
  /usr/build60/destdir/usr/lib/libpthread.so: undefined reference to `pthread__switch_return_point'
  collect2: ld returned 1 exit status
  *** Error code 1

-- 
Andreas Gustafsson, gson@gson.org