graphviz port missing some header files?

Hi, I installed the Graphviz port a couple of days ago (2.14) , and it installed fine. However, when I try to compile source depending upon it (Rgraphviz module of Bioconductor), it complains about missing header files/includes. I downloaded the official 2.14 distro of Graphviz and it does contain the missing files. However, I much rather use the MacPorts version! This was on an Intel Xserve, using OS X 10.4.10 Server. The missing files were (opt/local/include) graphviz/gvcint.h and graphviz/ globals.h. The graphviz header files include before those two are found, however, so there is nothing wrong with the include path. Thanks for your great effort, /Emil