You said that your output from phpinfo() / php -i does not contain the Configure Command. Can you post the output of php -i | head -n 10 php -i | head -n 10 ?
EDIT
Based on your comment that says PHP Version => 5.2.4-2ubuntu5.23 , it looks like you are using Ubuntu. I found a list of those versions of Ubuntu that include the PHP version here , which implies that you are using Hardy Heron. I found the details of a specific source package here , and the download date corresponds to the build date that you see on php -i output. Since you are using a 64-bit version of the package, the full Ubuntu compilation can be found here (warning: LONG). Scrolling through this, you can find configure commands for building apache2 on line 1815, collecting cgi on line 6170 and building cli on line 9164. To save you some scrolling, here is the command for building apache2 (i.e. package libapache2-mod-php5 ):
CFLAGS="-O2 -Wall -fsigned-char -fno-strict-aliasing -gstabs" PROG_SENDMAIL="/usr/sbin/sendmail" ../configure \ --prefix=/usr --with-apxs2=/usr/bin/apxs2 \ --with-config-file-path=/etc/php5/apache2 \ --with-config-file-scan-dir=/etc/php5/apache2/conf.d \ --build=x86_64-linux-gnu --host=x86_64-linux-gnu --mandir=/usr/share/man --enable-memory-limit --disable-debug --with-regex=php --disable-rpath --disable-static --with-pic --with-layout=GNU --with-pear=/usr/share/php --enable-calendar --enable-sysvsem --enable-sysvshm --enable-sysvmsg --enable-track-vars --enable-trans-sid --enable-bcmath --with-bz2 --enable-ctype --with-db4 --without-gdbm --with-iconv --enable-exif --enable-filepro --enable-ftp --with-gettext --enable-mbstring --with-pcre-regex=/usr --enable-shmop --enable-sockets --enable-wddx --with-libxml-dir=/usr --with-zlib --with-kerberos=/usr --with-openssl=/usr --enable-dbx --enable-soap --enable-zip --with-mime-magic=/usr/share/file/magic.mime --with-exec-dir=/usr/lib/php5/libexec --with-system-tzdata \ --without-mm \ --with-curl=shared,/usr \ --with-zlib-dir=/usr \ --with-gd=shared,/usr --enable-gd-native-ttf \ --with-gmp=shared,/usr \ --with-jpeg-dir=shared,/usr \ --with-xpm-dir=shared,/usr/X11R6 \ --with-png-dir=shared,/usr \ --with-freetype-dir=shared,/usr \ --with-ttf=shared,/usr \ --with-t1lib=shared,/usr \ --with-ldap=shared,/usr \ --with-ldap-sasl=/usr \ --with-mhash=shared,/usr \ --with-mysql=shared,/usr \ --with-mysqli=shared,/usr/bin/mysql_config \ --with-pspell=shared,/usr \ --with-unixODBC=shared,/usr \ --with-recode=shared,/usr \ --with-xsl=shared,/usr \ --with-snmp=shared,/usr \ --with-sqlite=shared,/usr \ --with-mssql=shared,/usr \ --with-tidy=shared,/usr \ --with-xmlrpc=shared \ --with-pgsql=shared,/usr PGSQL_INCLUDE=`pg_config --includedir` \ --enable-pdo=shared \ --without-pdo-dblib \ --with-pdo-mysql=shared,/usr \ --with-pdo-odbc=shared,unixODBC,/usr \ --with-pdo-pgsql=shared,/usr/bin/pg_config \ --with-pdo-sqlite=shared,/usr \ --with-pdo-dblib=shared,/usr
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