iostream not found

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Hi,

I am creating a catkin package that adds some .c and .cpp files to the library. The .c files come from some very old project and it can be built without ROS. When I try to catkinize the project, I dont want to modify these .c files but just add them to catkin library, together with other .cpp files. However, some of the c files have #include<iostream>, #include<iomanip>, and when I do catkin_make, it says iostream/iomanip no such file. Is there a way of using catkin_make without changing any original c files.

Thanks, Yiming