Вызов неопределенной функции pcntl_fork () Ubuntu Server Apache

У меня проблема с pcnt_fork

Я следовал этому руководству для установки

instalation of
pcntl
$ mkdir /tmp/phpsource
$ cd /tmp/phpsource
$ apt-get source php5
$ cd /tmp/phpsource/php5-*/ext/pcntl
$ phpize
$ ./configure
$ make
# then copy your module to php5 module-lib path (in my case:)
# and create an .ini-file to enable the module for sapi after graceful restart.

$ cp /tmp/phpsource/php5-*/modules/pcntl.so /usr/lib/php5/20090626/
$ echo "extension=pcntl.so" > /etc/php5/conf.d/pcntl.ini

on php.ini you need to
; This directive allows you to disable certain functions for security reasons.
; It receives a comma-delimited list of function names. This directive is
; *NOT* affected by whether Safe Mode is turned On or Off.
; http://php.net/disable-functions
;disable_functions pcntl_alarm,pcntl_fork,pcntl_waitpid,pcntl_wait,pcntl_wifexited,pcntl_wifstopped,pcntl_wifsignaled,pcntl_wexitstatus,pcntl_wtermsig,pcntl_wstopsig,pcntl_signal,pcntl_signal_dispatch,pcntl_get_last_error,pcntl_strerror,pcntl_sigprocmask,pcntl_sigwaitinfo,pcntl_sigtimedwait,pcntl_exec,pcntl_getpriority,pcntl_setpriority,

но если я загляну в журнал ошибок apache, то у меня PHP-фатальная ошибка: пока нет вызова неопределенной функции pcntl_fork (). !!