Error numbers vs. human-readable text

[Frank Elsner]

Hello *,
         what might be the reason for the following problem:

Two systems with self-compiled cyrus-2.3.16 (both with Solaris 10) 
give different responses to IMAP commands. The example is for the "logout"
command but all other IMAP commands are also affected.

[root at mailbackend-a /]# telnet localhost 143
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
* OK [CAPABILITY IMAP4 IMAP4rev1 LITERAL+ ID MUPDATE=mupdate://mupdate-febe.intern.tu-berlin.de/ AUTH=DIGEST-MD5 SASL-IR] mailcluster2.intern.tu-berlin.de Cyrus IMAP4 (Murder) v2.3.11 server ready
. logout
* BYE LOGOUT received
. OK Completed                                  <--- This looks OK
Connection to localhost closed by foreign host.
[root at mailbackend-a /]#

[elsnccpa at mailbackend-2 ~]$ telnet localhost 143
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
* OK [CAPABILITY IMAP4 IMAP4rev1 LITERAL+ ID MUPDATE=mupdate://mupdate-febe.intern.tu-berlin.de/ AUTH=DIGEST-MD5 SASL-IR COMPRESS=DEFLATE] mailbackend-2-febe.intern.tu-berlin.de Cyrus IMAP Murder v2.3.16 server ready
. logout
* BYE Unknown code imap 54
. OK Unknown code imap 55                       <--- This is ugly
Connection to localhost closed by foreign host.
[elsnccpa at mailbackend-2 ~]$

What might be the error in compilation or install that prevents correct mapping
to the human-readable text?


Thanks in advance for any pointer towards a solution,
Frank Elsner