Permissions (2.1.61)

After upgrading from 2.1.59 (which I never go up) to 2.1.61, trying to
log in to
the web interface gives (apache log)

[Wed Jan 22 09:40:42 2003] [error] Can’t locate RT/Handle.pm in @INC
(@INC contains: /opt/rt3/lib /opt/rt3/local/lib
/usr/lib/perl5/5.6.1/i386-linux /usr/lib/perl5/5.6.1
/usr/lib/perl5/site_perl/5.6.1/i386-linux /usr/lib/perl5/site_perl/5.6.1
/usr/lib/perl5/site_perl/5.6.0/i386-linux /usr/lib/perl5/site_perl/5.6.0
/usr/lib/perl5/site_perl /usr/lib/perl5/vendor_perl/5.6.1/i386-linux
/usr/lib/perl5/vendor_perl/5.6.1 /usr/lib/perl5/vendor_perl .
/etc/httpd/ /etc/httpd/lib/perl) at /opt/rt3/lib/RT.pm line 119.

The permision on “RT/Handle” were:
[root@host rt-2-1-61]# l /opt/rt3/lib/RT/Handle.pm
-rw-r----- 1 root bin 2.1k Jan 22 02:01
/opt/rt3/lib/RT/Handle.pm

I changed this to :
[root@host rt-2-1-61]# l /opt/rt3/lib/RT/Handle.pm
-rwxr-xr-x 1 root bin 2.1k Jan 22 02:01
/opt/rt3/lib/RT/Handle.pm
and, then the web interface showed up.

What are the permission supposed to be for "/installdir/rt3/lib/RT"
directory?