[PD] compiling external -- transfer win-osx

[marie blender]

hello list,

i am a newbie and have compliled an external on windows for the first  
time. now i need to compile it to run on osx.
while trying to build it, i have problems finding out what i need to  
substitute, can anybody tell me about this?

a crucial point is window´s pd/bin/pd.dll, what is the equivalent on  
os x?

i am using pd 0.38.4 on os x 10.4.5

any help is appreciated!

marie