% httpd -V
Server version: Apache/2.2.17 (Unix)
Server built:   Dec 17 2010 11:58:24
Server's Module Magic Number: 20051115:25
Server loaded:  APR 1.3.12, APR-Util 1.3.9
Compiled using: APR 1.3.12, APR-Util 1.3.9
Architecture:   32-bit
Server MPM:     Prefork
  threaded:     no
    forked:     yes (variable process count)
Server compiled with....
 -D APACHE_MPM_DIR="server/mpm/prefork"
 -D APR_HAS_SENDFILE
 -D APR_HAS_MMAP
 -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
 -D APR_USE_SYSVSEM_SERIALIZE
 -D APR_USE_PTHREAD_SERIALIZE
 -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
 -D APR_HAS_OTHER_CHILD
 -D AP_HAVE_RELIABLE_PIPED_LOGS
 -D DYNAMIC_MODULE_LIMIT=128
 -D HTTPD_ROOT="/etc/httpd"
 -D SUEXEC_BIN="/usr/sbin/suexec"
 -D DEFAULT_PIDLOG="logs/httpd.pid"
 -D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
 -D DEFAULT_LOCKFILE="logs/accept.lock"
 -D DEFAULT_ERRORLOG="logs/error_log"
 -D AP_TYPES_CONFIG_FILE="conf/mime.types"
 -D SERVER_CONFIG_FILE="conf/httpd.conf"

LoadModule auth_basic_module modules/mod_auth_basic.so
LoadModule auth_digest_module modules/mod_auth_digest.so
LoadModule authn_file_module modules/mod_authn_file.so

/etc/httpd/modules/mod_auth_basic.so

% ls /usr/lib/httpd/modules/
libphp5.so            mod_authnz_ldap.so      mod_dav_fs.so      mod_headers.so       mod_perl.so            mod_speling.so

% ls -l /etc/httpd/
total 12
drwxr-xr-x 2 root root 4096 Apr 26  2011 conf
drwxr-xr-x 3 root root 4096 Apr 26  2011 conf.d
-rw-r--r-- 1 root root   18 Feb 24  2009 htpasswd
lrwxrwxrwx 1 root root   19 Apr 26  2011 logs -> ../../var/log/httpd
lrwxrwxrwx 1 root root   27 Apr 26  2011 modules -> ../../usr/lib/httpd/modules
lrwxrwxrwx 1 root root   13 Apr 26  2011 run -> ../../var/run

/usr/libexec/apache2/libphp5.so

<Install Dir of PHP>/bin/php -i | grep apxs

APACHE_HOME/bin/apxs

#php -i | grep apxs

 Failed loading opcache.so:  opcache.so: cannot open shared object file: No    such file or directory PHP Warning:  PHP Startup: Unable to load dynamic library     '<PHP_HOME>/lib/php/extensions/debug-non-zts-20121212/memcached.so' - <PHP_HOME>/lib/php/extensions/debug-non-zts-20121212/memcached.so: undefined symbol: OnUpdateLongGEZero in Unknown on line 0