it is broken because the system builds the manual outside of the phpdoc tree. that means when $(srcdir) isn't properly used, the build breaks.
this is easy to test and fix on any (unix) system -- just make an empty directory, and run phpdoc's configure from there (using whatever absolute or relative path is appropriate). (oh, and from what i could tell, someone broke the zendapi doc integration recently by assuming the path would be relative. but i wouldn't be surprised if the recent change to the zendapi stuff to split it into different files didn't also break things, anyway.) jim