about RPM build options

Hi,

I've checked the build options for PostgreSQL 9.0.1,
I had some questions.

I downloaded rpms from below site.
http://www.postgresql.org/ftp/binary/v9.0.1/linux/rpms/redhat/rhel-5-x86_64/

====
1. enable thread safety?
  "--disable-thread-safety" is given.
  Before version 8.4, "--enable-thread-safety" is given for thread safe client library.
  I think it is not compatible before release. Is this intention thing?

2. enable dtrace?
  "--enable-dtrace" is not given.
  I want to give "--enable-dtrace", but is there any reason not to give it?
====

If there are any problem, please fix and add these options.

regards,
----------
Tomonari Katsumata
NTT Open Source Software Center
E-Mail: katsumata.tomonari@oss.ntt.co.jp