Installation
 
  This » PECL extension
is not bundled with PHP.
  Information for installing this PECL extension may be
found in the manual chapter titled Installation 
of PECL extensions. Additional information such as new releases,
downloads, source files, maintainer information, and a CHANGELOG, can be
located here: 
  » http://pecl.php.net/package/pdflib.
 
 
  To get these functions to work in PHP < 4.3.9, you have to compile
  PHP with --with-pdflib[=DIR]. DIR is
  the PDFlib base install directory, defaults to 
  /usr/local.