Why the lndir creation in Xorg/XFree86?

[Chris Staub]

In the build instructions for Xorg and XFree86, it is recommended to 
compile the "lndir" program and use it to create a "shadow directory of 
symbolic links" where you will actually built the package. Why is this 
done? Why not just a separate build dir? I think the BLFS book should 
have more of an explanation for this.
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