$ perl Makefile.PL
using php version 5.2.4-2ubuntu5
using prefix /usr
using includes -I/usr/include -I/usr/include/php5 -I/usr/include/php5/main -I/usr/include/php5/TSRM -I/usr/include/php5/Zend -I/usr/include/php5/ext -I/usr/include/php5/ext/date/lib -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64
using lddlflags -shared -L/usr/local/lib  -L/usr/lib -L/usr/lib
using libs -L/usr/lib -lphp5
Checking header files...
using incdir '/usr/include'
using incdir '/usr/include/php5'
using incdir '/usr/include/php5/main'
using incdir '/usr/include/php5/TSRM'
using incdir '/usr/include/php5/Zend'
using incdir '/usr/include/php5/ext'
using incdir '/usr/include/php5/ext/date/lib'
Found /usr/include/php5/Zend/zend.h
Found /usr/include/php5/Zend/zend_ini.h
Found /usr/include/php5/Zend/zend_interfaces.h
Found /usr/include/php5/Zend/zend_compile.h
Found /usr/include/php5/Zend/zend_API.h
Found /usr/include/php5/TSRM/TSRM.h
Found /usr/include/php5/main/php.h
Found /usr/include/php5/main/php_config.h
Found /usr/include/php5/main/php_ini.h
Found /usr/include/php5/main/SAPI.h
Found /usr/include/php5/main/php_main.h
Note (probably harmless): No library found for -lphp5
Writing Makefile for PHP::Interpreter