about libcurl.def

[flourishing]

i build libcurl via vs2005,  but i can't find any *.def file to specific the 
extern interface, but the dll compiled, it shows that it has the extern 
interface.
  
 and i searched google,   many people says use __declspec(dllexport)  but i 
searched the full folder, didn'f find this.
  
 my question is  , how  libcurl  make this happend ? :)