error about install xtrabackup

like the following,i try:

root@vmubuntu-VirtualBox:/win/xtrabackup-1.6/utils# sh build-binary.sh /win/mysql-5.1.57
rm: cannot remove `xtrabackup-1.6': Is a directory
root@vmubuntu-VirtualBox:/win/xtrabackup-1.6/utils# sh build-binary.sh /win/mysql-5.1.57.tar.gz
/win/mysql-5.1.57.tar.gz is not a directory
root@vmubuntu-VirtualBox:/win/xtrabackup-1.6/utils# sh build-binary.sh /win/
rm: cannot remove `xtrabackup-1.6': Is a directory
root@vmubuntu-VirtualBox:/win/xtrabackup-1.6/utils# sh build-binary.sh /win/mysql-5.1.57.tar.gz
/win/mysql-5.1.57.tar.gz is not a directory

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error about install xtrabackup

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