Обсуждение: compile pgtcl without PostgreSQL or Tcl source

I thought you had to have the header files and prototypes from the 
source. What makes it possible to compile pgtcl without source for 
PostgreSQL and Tcl?

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http://gborg.postgresql.org/project/pgtcl/projdisplay.php

The Postgres/Tcl library, libpgtcl, 1.4 beta 2 release is now available. 
... snip ... Finally, it includes a standard configure script and can be built 
without access to Postgres or Tcl source.