I have a BSD 7 system with the full BSD 8 sources loaded on it, and we use this 
box to build our custom BSD 8 kernel and tools. We do not install the custom 
code on the BSD 7 box but simply collect the artifacts as a basis for our 
custom BSD 8 image. I have a standalone tool that has previously been built on 
this same BSD 7 system, but it just uses gcc and links against the normal BSD 7 
libraries that are located on this box.

When we run this tool on a BSD 7 box it works fine. However, we've discovered 
one function it performs doesn't work properly. It uses kvm_read to collect 
network statistics and apparently applications that use this function have to 
be linked against the libraries of the actual target OS. One easy solution of 
course is to build our tool on a BSD 8 box, and in the long run we'll likely go 
that route as we move away from BSD 7. Right now though our build server is BSD 
7 and we need to build this tool against BSD 8 libraries. This obviously can be 
done since "make world" does exactly that-it builds everything against 8.0 
objects even if the build is done on a BSD 7 box.

Without dissecting the magic going on in "make world", can any explain how I 
could do the same thing with my standalone tool? Specifically, build it on a 
BSD 7 box but link it against BSD 8 libraries.

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