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You need to either build i2c.c into a library (like they do in their Makefile, you could use add_library) and link against that library with your target_link_libraries call (probably what I'd recommend), or you need to also build the source of i2c.c into the executable that you are producing (might be a bit tricky with the fact that their source code is C not C++).
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You need to either build i2c.c into a library (like they do in their Makefile, you could use add_library) and link against that library with your target_link_libraries call (probably what I'd recommend), or you need to also build the source of i2c.c into the executable that you are producing (might be a bit tricky with the fact that their source code is C not C++).
As it stands, the error you are seeing is because there is nothing in your CMakeLists.txt file even referencing the i2c.c source code.
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