How to call the APIs of hMETIS in an application?

I want to call the two APIs in hMETIS (ver. 1.5.3) from an application I wrote. But I can't find the appropriate header files in the Linux version of hMETIS, called hMETIS-1.5-linux. There is only a static library in it, along with some executables. How can I call the interfaces of hMETIS directly? Maybe it's a naive question. But it greatly challenges my wits.
Looking forward your reply! Thanks in advance.

Zhang, Ni