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no external libraries are needed to build this extension.
there is no installation needed to use these functions, they are part of the php core.

make sure your gd library and php are linked against the same depending libraries (e.g. libpng).
edellinen

the underlying quicksort function in some c libraries (such as on solaris systems) may cause php to crash if the comparison function does not return consistent values.
edellinen

configure looks for the client libraries and header files under the default paths /usr/dbplus, /usr/local/dbplus and /opt/dblus. if you have installed db++ in a different place you have add the installation path to the configure option like this: --with-dbplus=/your/installation/path.
these constants are defined by this extension, and will only be available when the extension has either been compiled into php or dynamically loaded at runtime.