xtrabackup package is missing binary xtrabackup_55

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#1 Mon, 2016-10-10 12:58
HansH
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I am using Alpine 3.4.4 on x86_64 with MariaDB and for the backup I installed with apk xtrabackup-2.1.8-r0
According to apk it will install :

xtrabackup-2.1.8-r0 contains:
usr/bin/xbstream
usr/bin/innobackupex
usr/bin/xtrabackup
usr/bin/xbcrypt

if I look at the xtrabackup I see :
host01:/etc# ls -l /usr/bin/x*
lrwxrwxrwx    1 root     root            12 Aug  8 06:20 /usr/bin/xargs -> /bin/busybox
-rwxr-xr-x    1 root     root       2857832 Apr 29 23:15 /usr/bin/xbcrypt
-rwxr-xr-x    1 root     root       3935600 Apr 29 23:15 /usr/bin/xbstream
-rwxr-xr-x    1 root     root          5126 May 16 10:21 /usr/bin/xsubpp
lrwxrwxrwx    1 root     root            22 Oct 10 10:21 /usr/bin/xtrabackup -> /usr/bin/xtrabackup_55
-rwxr-xr-x    1 root     root         14104 May 18 14:05 /usr/bin/xxd
lrwxrwxrwx    1 root     root            12 Aug  8 06:20 /usr/bin/xzcat -> /bin/busybox
host01:/etc#

So the xtrabackup in the package is only a softlink to a non existing binary xtrabackup_55
In other words the package is useless...
Am I missing something... do I get the xtrabackup_55 binary from somewhere else ?