Problem with madplay installation

Hi there,

I have successfully (I think) installed libmad-015.1b  and  
libid3tag-0.15.1b.  But when I try to install configure exits with an  
error:

id3tag.h was not found
you must first install libid3tag before you can build this package

I'm confused. Any help would be appreciated. I'm running CentOS 5

thanks
-bg

-----
Bill Goldsmith
Radio Paradise
www.radioparadise.com