I read:
you can compile pd... i don't know debian, so i don't know it the sources are with the binary deb packages. so try to find tcl/tk-sources deb package, and install it
in debian there are usually blabla.deb packages for the blabla lib or app or whatever and a blabla-dev.deb package for the development headers, no need to install the whole source (and probably in the wrong place where ./configure might not find the #include files anyway)
HTH
x