Installation: You'll want to have the following sources available somewhere: php rrdtool apache (if you built php as a DSO) Edit the *INCLUDE and *LIB variables in the Makefile to indicate the correct locations for your files. After php3_rrdtool.so builds correctly, copy this file to wherever you'd like. Possibly APACHE_ROOT/libexec/ . After you install, you should probably read README and API.