Description:
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This question may be intended not for you, but nevertheless...

php(5.1.2) compiled as module for apache(2.2.11) with 
--with-mysql=/u02/mysql --with-apxs2=/usr/local/apache2/bin/apxs --with-pgsql=/usr/local/pgsql --with-zlib --with-gd --with-freetype-dir --with-ttf --with-jpeg-dir --with-png-dir --with-xpm-dir.
Mod_auth_kerb(http://modauthkerb.sourceforge.net) compiled as module for apache too.
Mod_auth_kerb and libphp5(5.1.2) in combined work fine.

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I have upgrade php to 5.3.2.
php(5.3.2) compiled for apache with 
--with-mysql=/u02/mysql --with-apxs2=/usr/local/apache2/bin/apxs --with-pgsql=/usr/local/pgsql --with-zlib --with-gd --with-freetype-dir --enable-gd-native-ttf --with-jpeg-dir --with-png-dir --with-xpm-dir --with-readline --with-oci8 --with-mssql=/usr/local --with-openssl-dir=/usr/local/ssl --with-bz2 --with-mcrypt --enable-mbstring.
Use same mod_auth_kerb. 
Mod_auth_kerb and libphp5(5.3.2) in combined not work. In apache`s log this error - 
"gss_import_name() failed: Miscellaneous failure (, Can't open/find Kerberos configuration file)". 
In this case httpd try to use file /krb5/krb.conf (!?!?!?).
File /etc/krb5.conf exist and its correct.
Kerberos utils from command line work fine.

With php(5.1.2) httpd uses correct file /etc/krb5.conf. 
Now i must use php(5.1.2) but i need php(5.3.2). 

Please help. Thank you.