Building mod_perl for authentication

I've now tried various version of Perl (5.10.1, 5.12.4, 5.14.1), and various 
version of Apache, but I'm unable to get Apache to run when mod_perl is 
installed.

The error logs show
 symbol lookup error: /usr/local/lib/perl5/site_perl/5.14.1/x86_64-
linux/auto/ModPerl/Util/Util.so: undefined symbol: 
Perl_xs_apiversion_bootcheck

This is from an earlier attempt to test more recent versions of Perl, which 
seemed to do everything I need OK.  That led me to remove ./site_perl/5.14.1 
altogether, so at least I'm able to run Apache version 2.2.21 with Perl 5.12.4 
and mod_perl 2.0.5.

However authentication still doesn't work.  When I call $r->user in my 
authenticaion script for a URL that uses basic authentication, I don't get the 
login pop-up at all, and $r->user returns a value of  ' (single quote)

when I run make test in mod_perl, the logs show:

*** The following error entry is expected and harmless ***
[Sat Oct 08 08:27:58 2011] [error] [client 127.0.0.1] custom die hook: 
Undefined subroutine &TestError::runtime::no_such_func called at 
/home/daxtell/src/mod_perl-2.0.5/t/response/TestError/runtime.pm line 150.\n
[Sat Oct 08 08:28:03 2011] [error] [client 127.0.0.1] user stas: 
authentication failure for "/": Password Mismatch

*** The following error entry is expected and harmless ***
[Sat Oct 08 08:28:08 2011] [error] [client 127.0.0.1] need AuthName: 
/TestModperl__setauth
[Sat Oct 08 08:28:15 2011] [error] [client 127.0.0.1] Undefined subroutine 
&TestHooks::error::bomb called at 
/home/daxtell/src/mod_perl-2.0.5/t/hooks/TestHooks/error.pm line 21.\n
[Sat Oct 08 08:28:15 2011] [error] [client 127.0.0.1] Undefined subroutine 
&TestHooks::error::bomb called at 
/home/daxtell/src/mod_perl-2.0.5/t/hooks/TestHooks/error.pm line 21.\n


Any thoughts on why this would suddenly stop working?  Also, is there any 
reason not to try and use Perl 5.14.2 with mod_perl?

Thanks,
Dan