Filesystem Hierarchy Standard
There may be one or more variants of the /lib directory on
systems which support more than one binary format requiring separate
If one or more of these directories exist, the requirements for their
contents are the same as the normal /lib directory, except that
/lib<qual>/cpp is not required.[footnote 13]
 This is commonly used for 64-bit or 32-bit support on systems which
support multiple binary formats, but require libraries of the same name.
In this case, /lib32 and /lib64 might be the library
directories, and /lib a symlink to one of them.
 /lib<qual>/cpp is still permitted: this allows the case where
/lib and /lib<qual> are the same (one is a symbolic link
to the other).
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Translated by troff2html v1.5 on 29 March 2002 by Daniel Quinlan