#include <libq.h>
2. Step 2 is adding those libs to libraries folder of the project as follow:

libq-coff.a
libq-dsp-coff.a
libq-dsp-elf.a
libq-elf.a 3. Step 3 : right-click project --> Properties. Modify configuration as follow:

Press Apply and OK. 4. Clean and rebuild project.
Edit : If the path of lib files contains spaces, build error will happen. Therefore, we can copy those lib files to another folder (without spaces in path) and include them in our project.