How to engage other package with my project?

[medo02]

I am working with a project using c++ under Unix, I am trying to merege other package that built by c but I have a problem, that is when call a specific function fatal error appears and there is include file called config.h this file is one of many preprocessing files that is not exist.

[weaknessforcats]

1)You need to have the function prototytpes in the files where you call the C functions.
2) Usually, there are header files for these prototypes.
3) You need to turn off the name mangler in C++ or you will never find the C file name. Be sure you have:

extern "C"
{
#include <C Package Header File Name>
}

in your C++ source files.