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DEPENDENCIES:

on freebsd it's possible to add the dependencies compiling
and installing the php port.

under the php directory in /usr/ports/lang/php5:
sudo make install

TO BUILD:

NOTE: with PHP 5.4 the API has changed!
To compile under PHP 5.4 open the file ifconfig.h and uncomment the line:
  //#define PHP54
to enable the changes.

phpize
./configure --enable-ifconfig
make

TO INSTALL:

cp modules/*.so `php-config --extension-dir`
cp ifconfig.ini /etc/php5/conf.d/ (in debian)
cp ifconfig.ini /usr/local/"your php conf directory" (on freebsd, via ports)

you can also try:
make install
but you'll probably need to adjust your php.ini even in this case.

TO TEST:

php -r 'echo ifconfig();'
php -r 'var_dump(ifconfig());'