forsi.it

Step by step what I did to compile it

1. download PHP sources from www.php.net
2. run configure script
   

   $ ./configure --enable-debug --enable-experimental-zts --disable-cgi
   [...]
   

   I added --disable-cgi else I could not make it to generate the CLI version.
   Edit: later it built the PHP SAPI module for Apache and the CLI version

   $ ./configure --with-apxs --enable-debug --enable-experimental-zts
   [...]
   Installing PHP SAPI module:       apache
   [activating module `php4' in /etc/apache/httpd.conf]
   cp libs/libphp4.so /usr/libexec/apache/libphp4.so
   chmod 755 /usr/libexec/apache/libphp4.so
   cp /etc/apache/httpd.conf /etc/apache/httpd.conf.bak
   cp /etc/apache/httpd.conf.new /etc/apache/httpd.conf
   rm /etc/apache/httpd.conf.new
   Installing PHP CLI binary:        /usr/local/bin/
   [...]
   

3. compile PHP

   $ make
   [...]
   /usr/include/asm/errno.h:4:31: asm-generic/errno.h: No such file or directory
   [...]
   

   I didn't install the kernel headers and the configure script didn't notice. The asm-generic dir is in glibc-devel or, for Slackware it is only in 2.6 kernel headers such as kernel-headers-2.6.16.27-i386-1 so I need to install this package too.

4. install PHP
   

   $ sudo make install
   Password:
   Installing PHP CLI binary:        /usr/local/bin/
   Installing PHP CLI man page:      /usr/local/man/man1/
   Installing PEAR environment:      /usr/local/lib/php/
   [PEAR] Archive_Tar: bad md5sum for file /usr/local/lib/php/Archive/Tar.php
   [PEAR] Console_Getopt: bad md5sum for file /usr/local/lib/php/Console/Getopt.php
   [PEAR] HTML_Template_IT: bad md5sum for file /usr/local/lib/php/HTML/Template/IT.php
   [PEAR] Net_UserAgent_Detect- installed: 2.0.1
   warning: pear/PEAR requires package "pear/Archive_Tar" (recommended version 1.3.1)
   warning: pear/PEAR requires package "pear/Console_Getopt" (recommended version 1.2)
   pear/PEAR can optionally use package "pear/XML_RPC" (version >= 1.4.0)
   [PEAR] PEAR           - installed: 1.4.6
   Wrote PEAR system config file at: /usr/local/etc/pear.conf
   You may want to add: /usr/local/lib/php to your php.ini include_path
   [...]
   Installing build environment:     /usr/local/lib/php/build/
   Installing header files:          /usr/local/include/php/
   Installing helper programs:       /usr/local/bin/
     program: phpize
     program: php-config
   Installing man pages:             /usr/local/man/man1/
     page: phpize.1
     page: php-config.1
   

5. quick check

   $ /usr/local/bin/php -v
   PHP 4.4.2 (cgi) (built: Jul 31 2006 23:03:26) (DEBUG)
   Copyright (c) 1997-2006 The PHP Group
   Zend Engine v1.3.0, Copyright (c) 1998-2004 Zend Technologies
   

6. put example files from zend.com in a directory

   $ cd ext && mkdir hello && cd $_
   $ ls
   config.m4  hello.c  php_hello.h
   

7. compile

   $ phpize
   Configuring for:
   PHP Api Version:         20020918
   Zend Module Api No:      20020429
   Zend Extension Api No:   20050606
   $ ./configure --enable-hello
   [...]
   $ make
   [...]
   $ sudo make install
   Password:
   Installing shared extensions:     /usr/local/lib/php/extensions/debug-zts-20020429/
   

8. quick check (without editing php.ini)

   $ php -r 'dl("hello.so"); echo hello_world();'
   Hello World
   

9. time needed to make (and correct ;-) a lot of mistakes: 1 hour 15 minutes...