Download the SQL Anywhere PHP extension from  http://download.sybase.com/ianywhere/php/2.0.3/src/sasql_php.zip.

From the directory where you saved the SQL Anywhere PHP extension, extract the files to the ext subdirectory of the PHP source tree (Mac OS X users should replace tar with gnutar):

$ tar -xzf sasql_php.zip -C PHP-source-directory/ext/

For example:

$ tar -xzf sqlanywhere_php-1.0.8.tar.gz -C ~/php-5.2.11/ext

Make PHP aware of the extension:

$ cd PHP-source-directory/ext/sqlanywhere
$ touch *
$ cd ~/PHP-source-directory
$ ./buildconf

The following example is for PHP version 5.2.11. You must change php-5.2.11 below to the version of PHP you are using.

$ cd ~/php-5.2.11/ext/sqlanywhere
$ touch *
$ cd ~/php-5.2.11
$ ./buildconf

Verify that PHP is aware of the extension:

$ ./configure -help | egrep sqlanywhere

If you were successful in making PHP aware of the SQL Anywhere extension, you should see the following text:

--with-sqlanywhere=[DIR]

If you are unsuccessful, keep track of the output of this command and post it to the sybase.public.sqlanywhere.linux newsgroup for assistance.