Why is `phpize` throwing a \'config.m4 not found\' error on Debian/Ubuntu?

Installing and Running phpize on Debian/Ubuntu

Issue:

While attempting to install ffmpeg as a PHP extension, the user encounters an error when running phpize. The error indicates that config.m4 cannot be found.

Solution:

For recent versions of Debian/Ubuntu (Debian 9 or Ubuntu 16.04 ), the solution is to install the php-dev dependency package:

sudo apt install php-dev

This will automatically install the correct version of php{x}-dev for your distribution.

Older Versions of Debian/Ubuntu:

For PHP 5, install the php5-dev package:

sudo apt-get install php5-dev

For PHP 7.x, install the php7.x-dev package:

sudo apt-get install php7.x-dev

RHEL/CentOS/yum:

On systems using yum, install the php-devel package:

yum install php-devel

Additional Notes:

• Ensure that you are running phpize from the top-level directory of the module you are trying to install.
• If you still experience issues, make sure that autoconf, automake, libtool, and m4 are installed.

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