karlphillip's answer is correct, and you should follow it. Be advised, however, that if you're building the files using VS 2010, a few of them will fail and return this error:
LINK : fatal error LNK1104: cannot open file '..\lib\Debug\cvblob.lib'
To get around this, add the following to your cvblob.h file:
#define EXPORT __declspec (dllexport)
In the extern "C" block below that, add EXPORT before every function. For example:
EXPORT double cvContourPolygonArea(CvContourPolygon const *p);
After running into this error myself, I found the explanation here (which I adapted to make this post; all credit belongs to this link's author): https://code.google.com/p/cvblob/issues/detail?id=34
Just something you might want to watch out for. Hope it helps!