[arch-dev-public] Edit /etc/php/php.ini config file in chroot

Hi, I am using devtools to create a package with php scripts. It uses composer to build the package. I get the error: The requested PHP extension ext-iconv * is missing from your system. Install or enable PHP's iconv extension. This can be solved by editing the config file and add: extension=iconv The config file is only accessible by root. How do I edit this config file within the PKGBUILD if its build by devtools? Any idea? ~Nico