Само лучше это сделать таким мокаром:

httpd -V

И примерно выдаст:

# httpd -V
Server version: Apache/1.3.33 (Unix)
Server built: Apr 4 2005 01:29:24
Server's Module Magic Number: 19990320:16
Server compiled with....
-D HAVE_MMAP
-D USE_MMAP_SCOREBOARD
-D USE_MMAP_FILES
-D HAVE_FLOCK_SERIALIZED_ACCEPT
-D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
-D DYNAMIC_MODULE_LIMIT=64
-D HARD_SERVER_LIMIT=512
-D SO_ACCEPTFILTER
-D ACCEPT_FILTER_NAME="httpready"
-D HTTPD_ROOT="/usr/local"
-D SUEXEC_BIN="/usr/local/sbin/suexec"
-D DEFAULT_PIDLOG="/var/run/httpd.pid"
-D DEFAULT_SCOREBOARD="/var/run/httpd.scoreboard"
-D DEFAULT_LOCKFILE="/var/run/httpd.lock"
-D DEFAULT_ERRORLOG="/var/log/httpd-error.log"
-D TYPES_CONFIG_FILE="etc/apache/mime.types"
-D SERVER_CONFIG_FILE="etc/apache/httpd.conf"
-D ACCESS_CONFIG_FILE="etc/apache/access.conf"
-D RESOURCE_CONFIG_FILE="etc/apache/srm.conf"