Use raylib with Code Blocks

Recommended method

Use the template project: https://github.com/raysan5/raylib/tree/master/projects/CodeBlocks

Makefile method

Guide provided by Mark in raylib forum

NOTE: This guide is intended for Code:Blocks on Windows, using MinGW compiler.

First, under Project Settings check the box that says, "This is a custom Makefile".

Then, in your project's folder create a file named Makefile and paste the following:

files = main.c
output = main.exe

Debug:
	gcc -g -o obj/Debug/$(output) $(files) \
		c:/raylib/raylib/raylib_icon \
		-Ic:/raylib/raylib/src \
		-Lc:/raylib/MinGW/bin \
		-Lc:/raylib/MinGW/include/GLFW \
		-Iexternal -lraylib -lglfw3 -lopengl32 -lgdi32 -lopenal32 -lwinmm \
		-std=c99 -Wl,-allow-multiple-definition -Wl,--subsystem,windows -Wall

Release:
	gcc -s -o obj/Release/$(output) $(files) \
		c:/raylib/raylib/raylib_icon \
		-Ic:/raylib/raylib/src \
		-Lc:/raylib/MinGW/bin \
		-Lc:/raylib/MinGW/include/GLFW \
		-Iexternal -lraylib -lglfw3 -lopengl32 -lgdi32 -lopenal32 -lwinmm \
		-std=c99 -Wl,-allow-multiple-definition -Wl,--subsystem,windows

cleanDebug:
	del /F /Q obj/Debug/*.*

cleanRelease:
	del /F /Q obj/Release/*.*

Change files and output variables as you see fit.