CMake - Linking external C++ library

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Hello,

I have an external .cpp library that requires both the following libraries: atlas, llpack and lblas

Now if for example, I compile using terminal (on the same machine) I can use the following:

g++ main.cpp hmm.cpp -I /usr/include/atlas -L /usr/lib64/atlas/ -llapack -lblas

This will work. I don't know how to include these libraries into the CMake list in ROS. I have, currently, the following:

rosbuild_add_executable(build1 src/hmm.c)

What would I have to add into my CMake list to make this work?

Thanks