moved to 5.1.12-beta from 5.1.11-beta ...partitioning gone?

[John Smrekar]

It is my understanding that all 5.1.12 binaries should have partitioning compiled in yet when I look at my variables....
mysql> show variables like 'version';
+-------------------------+------------------------------+
| Variable_name | Value |
+-------------------------+------------------------------+
| version | 5.1.12-beta-log |
| version_comment | MySQL Community Server (GPL) |
| version_compile_machine | i686 |
| version_compile_os | pc-linux-gnu |
+-------------------------+------------------------------+
mysql> show variables like 'have_partitioning';
+-------------------+-------+
| Variable_name | Value |
+-------------------+-------+
| have_partitioning | NO |
+-------------------+-------+

binary downloaded: mysql-5.1.12-beta-linux-i686-glibc23.tar.gz

There are no errors of any kind in my logs. I was using table partitioning with 5.1.11-beta. I went ahead and created my previously partitioned table without the partition information knowing that adding the partitions later is cake. Does anyone have any insight into this? Is this a mistake in the binary or can partitioning be set to "NO" if my configuration isn't set up properly?

Thanks
John