Configure the postfix email server on RHLS5.4

On RHLS5.4, configure the postfix Mail Server-Linux Enterprise Application-Linux server application information. For more information, see the following. Hello everyone, younger brother is a newbie, recently busy with a mail server, when installing the httpd-2.2.4 problems, first in the last line of compilation appears config. status: executing default commands
My compilation file is: #./configure
-- Prefix =/usr/local/apache
-- Sysconfdir =/etc/httpd
-- Enable-so
-- Enable-ssl
-- With-ssl =/usr/local/ssl
-- Enable-track-vars
-- Enable-rewrite
-- With-zlib
-- Enable-mod-shared = most
-- Enable-suexec
-- With-suexec-caller = daemon
Then the following problem occurs after make:
Xlate/xlate. lo dbd/mongodbd/apr_dbd.lo dbd/apr_dbd_sqlite2.lo dbd/apr_dbd_pgsql.lo-luuid-lrt-lcrypt-lpthread-ldl-lsqlite3/usr/lib/libexpat. la/usr/local/src/httpd-2.2.4/srclib/apr/libapr-1.la-luuid-lrt-lcrypt-lpthread-ldl
/Usr/lib/libexpat. so: cocould not read symbols: File in wrong format
Collect2: ld returned 1 exit status
Make [3]: *** [libaprutil-1.la] Error 1
Make [3]: Leaving directory '/usr/local/src/httpd-2.2.4/srclib/apr-util'
Make [2]: *** [all-recursive] Error 1
Make [2]: Leaving directory '/usr/local/src/httpd-2.2.4/srclib/apr-util'
Make [1]: *** [all-recursive] Error 1
Make [1]: Leaving directory '/usr/local/src/httpd-2.2.4/srclib'
Make: *** [all-recursive] Error 1
What is the problem? How should I solve it!