encrypt() always gives "NULL" on Red Hat 7.0:

[hli@lexus] ~ $ mysql
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 98 to server version: 3.23.29-gamma-log

Type 'help;' or '\h' for help. Type '\c' to clear the buffer

mysql> select encrypt("hello");
+------------------+
| encrypt("hello") |
+------------------+
| NULL             |
+------------------+
1 row in set (0.00 sec)

mysql> select encrypt("hello",1234);
+-----------------------+
| encrypt("hello",1234) |
+-----------------------+
| NULL                  |
+-----------------------+
1 row in set (0.00 sec)



I am using Red Hat 7.0's updated mysql-3.23.29-1 and glibc-2.2-9.
According to
http://www.mysql.com/documentation/mysql/commented/manual.php?section=Miscellaneous_functions
"If crypt() is not available on your system, ENCRYPT() always returns
NULL.". So I suspect that this is glibc's problem.

Before I upgraded to RH70 I was running mysql-3.22.32 with glibc-2.1.3
(both compiled myself), and encrypt definitely worked. Now with glibc-2.2
even if I pull out the same /usb/bin/mysql executable from mysql-3.22.32
encrypt gives NULL.

I noticed this problem because after the upgrade to RH70 my bugzilla broke.
The authenticate doesn't work any more and I traced it down to the
encrypt() which always give NULL.

Any help would be greatly appreciated since it is impossible for me to
downgrade glibc, unless I bring up a new box with RH62.