Can't compile plphp

I'm following the directions here:
http://plphp.commandprompt.com/documentation.html

(Note that they differ from the directions included in
plphp-7.4.x.tar.bz2, which I've also tried.)

Using Postgres 7.4.7 and PHP 5.0.4. When I do this:

7. Build and install your plphp.so library.
      cd src/pl/plphp
      make && make install

I get this error:
cp @php_path@/main/php.h ./
cp: cannot stat `@php_path@/main/php.h': No such file
or directory
make: *** [patch] Error 1

Know what the problem is?

Thanks,
CSN


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