I seem to be having problems understanding exactly what I should do to
get Listserv 15.5 hooked up to a MySQL database on a fairly old (Fedora
6) server.

Here's the bit from go.user:

The hook in go.user:
UODBC_DSN="listserv"
UODBC_UID="[redacted]"
UODBC_AUTH="[redacted]"
export UODBC_DSN UODBC_UID UODBC_AUTH

Here's the error I'm getting:

Serious error occurred - traceback follows
------------------------------------------
 >>> Error X'01000033' opening DBMS list <<<
-> Severity: Error
-> Facility: DBMS interface
-> Abstract: DBMS driver failed to initialize
 >>> Error X'01000033' opening DBMS list <<<
-> Severity: Error
-> Facility: DBMS interface
-> Abstract: DBMS driver failed to initialize
 >>> Error X'01000033' opening DBMS list <<<
-> Severity: Error
-> Facility: DBMS interface
-> Abstract: DBMS driver failed to initialize
 >>> Error X'01000033' opening DBMS list <<<
-> Severity: Error
-> Facility: DBMS interface
-> Abstract: DBMS driver failed to initialize
 >>> Error X'01000033' opening DBMS list <<<
-> Severity: Error
-> Facility: DBMS interface
-> Abstract: DBMS driver failed to initialize
 >>> Error X'01000033' opening DBMS list <<<
-> Severity: Error
-> Facility: DBMS interface
-> Abstract: DBMS driver failed to initialize

Here's the relevant line from the list header:
DBMS= UODBC,Table(LISTSERV),Email(email),Name(name),Uemail(uemail)

Using isql shows:
[mickc@gandalf etc]# isql -v listserv [redacted] [redacted]
SQL> show tables;
+-----------------------------------------------------------------+
| Tables_in_listserv                                              |
+-----------------------------------------------------------------+
| changelog                                                       |
+-----------------------------------------------------------------+
SQLRowCount returns 1
1 rows fetched


Can someone suggest where I've gone wrong here?