In a GIF viewer program, there are three .c files: ui.c, loader.c and render.c. As per convention, each .c file includes its own header file. In addition, ui.c includes the other two header files, and render.c includes loader.cs header file and uses the math library. Produce a suitable makefile for this project, in the form emphasised in the lectures and tutorials. The executable file should be named gifviewer.