How to fix error with xml2-config not found when installing PHP from sources?

Ubuntu, Debian:

sudo apt install libxml2-dev

Centos:

sudo yum install libxml2-devel

I had the same issue when I used a DockerFile. My Docker is based on the php:5.5-apache image.

I got that error when executing the command RUN docker-php-ext-install soap

I have solved it by adding the following command to my Dockerfile:

RUN apt-get update && apt-get install -y libxml2-dev

For the latest versions it is needed to install libxml++2.6-dev like that:

apt-get install libxml++2.6-dev

All you need to do instal install package libxml2-dev for example:

sudo apt-get install libxml2-dev

On CentOS/RHEL:

sudo yum install libxml2-devel

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