Hi ykish,
I have used libcurl.lib in a Mac ID CS2 plug-in, but it was a while ago. I believe it was really easy to do.
Just add the file, "libcurl.lib" to your CodeWarrior project. Choose Project > Add Files. You will want to add it to both the Release and Debug targets.
To use the library, just #include the "curl.h" header file to the c++ file that contains your CURL calls.
As I said, it was a while ago. The hardest part, as I remember, was getting the lib file created. I used a static library version of libcurl.
I hope this helps!
-- Jim