authnz_external_module and pwauth on CentOS 6.2 failure

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What steps will reproduce the problem?
1. Install module 3.2.6 as described by documentation
2. Configure and install pwauth 2.3.10 for PAM authentication 
3. Configure httpd.conf as described by documentation

What is the expected output? What do you see instead?
pwauth works as expected when tested on command line but not through 
authnz_external_module
------------------------------------------------------------
[root@sbctos4 /]# sudo -u apache /usr/local/bin/pwauth
pwtest
m0d3xt3rn@l
[root@sbctos4 /]# echo $?
0
Using wrong name or password returns 1 as expected
-----------------------------------------------------------

What version of the product are you using? On what operating system?

[root@sbctos4 /]# httpd -v
Server version: Apache/2.2.15 (Unix)
Server built:   Feb 13 2012 22:31:42

[root@sbctos4 /]# uname -a
Linux sbctos4 2.6.32-220.el6.x86_64 #1 SMP Tue Dec 6 19:48:22 GMT 2011 x86_64 
x86_64 x86_64 GNU/Linux

authnz_external_module: 3.2.6
pwauth: 2.3.10


Please provide any additional information below.
Same configuration works on CentOS 5  (2.6.18-308.4.1.el5) but not on CentOS 6.2

CentOS 6.2 Configuration follows:
-----------------------------------------------------------------
-rwsr-xr-x. 1 root root 20382 Jun  9 17:29 /usr/local/bin/pwauth
-----------------------------------------------------------------
pwauth config.h and Makefile attached
/etc/pam.d/pwauth attached
/etc/httpd/conf/httpd.conf attached

Original issue reported on code.google.com by [email protected] on 10 Jun 2012 at 12:13

Attachments:

• config.h
• httpd.conf
• Makefile
• pwauth