Error while loading shared libraries: libusb-0.1.so.4: cannot open shared object file: No such file or directory

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Help!

I have installed the GnuPG binary on a Linux machine. 
Any idea why I would need the library
"libusb-0.1.so.4" to run GnuPG 1.4?

The following are a set of commands I ran to
troubleshoot:

[root at blah]# /usr/bin/gpg --homedir /opt/pgp/certdb/
--gen-key
/usr/bin/gpg: error while loading shared libraries:
libusb-0.1.so.4: cannot open shared object file: No
such file or directory
[root at blah]# ls -al /usr/bin/gpg
-rwxr-xr-x    1 root     root      1682239 Jun  1
10:19 /usr/bin/gpg
[root at blah]# ls /usr/lib
lib      libexec
[root at blah]# ls /usr/lib/libusb*
ls: /usr/lib/libusb*: No such file or directory
[root at blah]# ls /usr/lib/libu*
/usr/lib/libuser.so.1  /usr/lib/libuser.so.1.1.1 
/usr/lib/libutempter.so  /usr/lib/libutempter.so.0 
/usr/lib/libutempter.so.0.5.2

/usr/lib/libuser:
libuser_files.so  libuser_ldap.so  libuser_shadow.so 

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