Installation:
Install Gnu Make; download from xmake.org
Install XMake; download from xmake.org
Configure XMake: enable PHP file processing, etc.
Use XMake with PHP:
Install PHP CLI SAPI (PHP >= 4.3.2 recommended)
Create a new project with 'xmakep' command
Create some source files with .phpc suffix
Process all source files with 'xmake' command
Optional: create custom makefile rules