install mailscanner on centos7 / centos 8

[support at mmarzouki.de]

hello,

i want to install mailscanner for centos7.
but after the sucessfully installation of install.sh from github https://github.com/MailScanner/v5/tree/master/builds
the mailscanner doesn't start.
then i installed the rpm package to and i received this message from systemd:


[root at mg-mailscanner ~]# systemctl status mailscanner.service
● mailscanner.service - LSB: MailScanner daemon
   Loaded: loaded (/usr/lib/MailScanner/init/ms-init; disabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Wed 2020-04-01 20:53:23 CEST; 6s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 23595 ExecStart=/usr/lib/MailScanner/init/ms-init start (code=exited, status=1/FAILURE)

Apr 01 20:53:21 mg-mailscanner.test.com systemd[1]: Starting LSB: MailScanner daemon...
Apr 01 20:53:21 mg-mailscanner.test.com ms-init[23595]: MailScanner starting ...
Apr 01 20:53:23 mg-mailscanner.test.com ms-init[23595]: Can't locate Filesys/Df.pm in @INC (you may need to install the Filesys::Df module) (@INC con>
Apr 01 20:53:23 mg-mailscanner.test.com ms-init[23595]: BEGIN failed--compilation aborted at /usr/sbin/MailScanner line 88.
Apr 01 20:53:23 mg-mailscanner.test.com systemd[1]: mailscanner.service: Control process exited, code=exited status=1
Apr 01 20:53:23 mg-mailscanner.test.com systemd[1]: mailscanner.service: Failed with result 'exit-code'.
Apr 01 20:53:23 mg-mailscanner.test.com systemd[1]: Failed to start LSB: MailScanner daemon.



is this a bug?
what is the problem?

thank you very much.

kind regards