Insert /usr/local/lib in /etc/ld.so.conf
#/sbin/ldconfig
Test & Hack
Now you need to restart Apache
#apachectl restart
Copy pdfclock.php in your httpd directory... test... and That's all.
Important Notes
To get working PDFLib with fonts you must pay attention to the UPR section of the PDFLib manual.
A simple way to use fonts with PDFLib is to copy the standard UPR description file included in PDFLib tarball,
(fonts/pdflib.upr) into your working directory.