Searching configured and relocated prefix.

[DJ Delorie]

> Yes, that's clever.  But, you can create a symbolic link to the
> sysroot from each installation with a single command.  And, your
> installer for third-party developers can do that for you.

Beware - the linker expands symlinks to determine if a library comes
from the sysroot or not.  It affects "libraries" which are really
linker scripts (like libc.so); the linker will relocate the paths
within *if* the library exists - truely exists - in the sysroot
directory.  Symlinks *to* the sysroot location work, symlinks *from*
the sysroot location break the linker.

At least, last time I was bitten by this, that's how it worked.