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

from the document,there is not a buildtree.sh script