cyradm not working on a working cyrus /2.1.112.1.12

[Grosswiler Roger]

As on version 2.1.11 i get cyrus up und running without any problem -
except cyradm. A call of cyradm brings out the mentionned error msg. if i
copy shell.pm in the path, a new prompt line results, nothing happens at
all.

Does anybody know about this issue? Is there another possibility to
administer the cyrus mailboxes?

error msg:
Shell.pm not found @INC .... (followed by the path list...)

System: Redhat 8.0
Sasl: 2.1.11
Berkeley DB: db4 /db4 devel

thx
Roger