To clarify for everyone, you don't necessarily have to rebuild
collections on different machines - in many cases you can move a built
collection, as long as both have a CPU of the same "endianness".

Intel and AMD chips are called "little endian", and most others
(including powerpc) are called "big endian".

So a collection built on a linux machine using an Intel chip can be
copied ok to a windows machine using an AMD chip (and vice versa). And a
collection built on a mac using a PowerPC chip can be copied to a
PowerPC machine running linux (and vice versa). If you want to copy a
collection between architectures of a different endian, follow Michael's
instructions above. (You'll need to source setup.bash on the command
line to have access to the txt2db and db2txt programs.)

John McPherson