EDIT

## How to install php5.3 to php5.2 in parallel

_This instructions are specific to Debian Linux and derivatives like Ubuntu from version 12.04 on. For install php5.3 to php5.2 in parallel in older distributions please refer to [[Install_php53_to_php52_in_parallel_ubuntu-1110|Install php5.3 to php5.2 in parallel in ubuntu-11.10]]._

 **In the following you will find a brief description on how to compile and install php 5.2 from source.** 

see also: 

* http://bernhardhaeussner.de/blog/89_Howto:_PHP5.3_parallel_zu_PHP5_installieren

* http://artur.ejsmont.org/blog/content/compiling-and-building-php-53-on-ubuntu

### Install additional packages

~~~

apt-get install bison re2c libmysqlclient-dev libbz2-dev bzip2 libxslt1.1 libxslt1-dev libxml2 libxml2-dev libjpeg62-dev libpng12-dev libxpm-dev

~~~

_You may need more package if you are not having apache2, mysql, gcc and linux sources._  

### Check symlinks in /usr/lib (Ubuntu only, not needed for Debian?)

Check if the below symlinks exist in @/usr/lib@, if nor create them!:

~~~

# cd /usr/lib

# ln -s x86_64-linux-gnu/libjpeg.a libjpeg.a

# ln -s x86_64-linux-gnu/libjpeg.so libjpeg.so

# ln -s x86_64-linux-gnu/libpng.a libpng.a

# ln -s x86_64-linux-gnu/libpng.so libpng.so

# ln -s x86_64-linux-gnu/libXpm.so libXpm.so

# ln -s x86_64-linux-gnu/libgd.a libgd.a

# ln -s /usr/include/gd.h gd.h

# ln -s /usr/lib/x86_64-linux-gnu/libmysqlclient.so /usr/lib/

~~~

see also https://github.com/vladgh/VladGh.com-LEMP/blob/master/install_files/php.sh

### Download and extract php 5.2 source

1. download http://php.net/downloads.php

1. extract

1. cd into the extracted folder

### Run the configure command

_This configuration is based on based on [pkg-php/php.git/debian/rules":http://anonscm.debian.org/gitweb/?p=pkg-php/php.git;a=blob_plain;f=debian/rules;hb=HEAD._ The php5.2 rules are found "here](http://anonscm.debian.org/gitweb/?p=pkg-php/php.git;a=blob_plain;f=debian/rules;hb=41ffb985b80d560777d6c9f9264d129cc6d386ee)

Run the configure command below inside the extracted php source folder.

 `dpkg-architecture -qDEB_HOST_GNU_TYPE` 

./configure is *reporting errors*:

1. I you are getting an error like `configure: error: xxxx not found. Please check your XXXX installation.`  Check if you have installed the xxx package and also the according development package.  

1. You can debug your the configuration by searching for the line of code in  `./configure` wich is producing the error message and add the following code snipped before the lines found:

~~~

###DEBUG

set -x

~~~

Execute the configure command again an see the detailed output.

### Build and install

~~~

make

# optional, dauert, findet aber Fehler:

make test

# bringt die Dateien an ihren Platz: 

sudo make install | tee php52-install.log

~~~

### Configure Apache

This was the tricky part! 

Now please follow the instruction on: http://bernhardhaeussner.de/blog/89_Howto:_PHP5.3_parallel_zu_PHP5_installieren