[boost] What does "install dist-lib" in the inspect Jamfile do?

Subject: [boost] What does "install dist-lib" in the inspect Jamfile do?
From: Peter Dimov (lists_at_[hidden])
Date: 2014-12-29 10:40:33

I'm looking at Boost.Inspect's Jamfile as an example of how installation is 
done, and it has:

install dist-bin
    :
    inspect
    :
    <install-type>EXE
    <location>../../../dist/bin
    :
    release
    ;

install dist-lib
    :
    inspect
    :
    <install-type>LIB
    <location>../../../dist/lib
    :
    release
    ;

The first one I get; it copies inspect.exe to dist/bin. But what does the 
second one do?