mariabackup --decompress breaks due to qpress not found

mariabackup --decompress breaks due to qpress not found

expected
qpress is either prerequeted to be installed in MariaDB Backup user guide
or it's included in the MariaDB-Backup package

how to repeat:
1. perform mariabackup with option --compress
2. issue the mariabackup --decompress step – it's fails – qpress not found

1.
mariabackup --backup --compress --compress-threads=2 --compress-chunk-size=512K --target-dir /var/mariadb/backupcr2
180125 15:56:38 Connecting to MySQL server host: localhost, user: not set, password: not set, port: not set, socket: not set
Using server version 10.2.12-MariaDB
mariabackup based on MariaDB server 10.2.12-MariaDB Linux (x86_64)
~~~~~

[root@t4w3 mysql]# ls /var/mariadb/backupcr1
aria_log.00000001.qp backup-my.cnf.qp ib_buffer_pool.qp ib_logfile0 mysql test xtrabackup_info.qp
aria_log_control.qp boxoffice_mdb ibdata1.qp ib_logfile0.qp performance_schema xtrabackup_checkpoints

2.
[root@t4w3 mysql]# mariabackup --decompress --remove-original --target-dir /var/mariadb/backupcr1
mariabackup based on MariaDB server 10.2.12-MariaDB Linux (x86_64)
180125 16:03:34 [01] decompressing ./ib_logfile0.qp
sh: qpress: command not found
cat: write error: Broken pipe
Error: thread 0 failed.