Added SDL2 and glad to create window.

.gitignore

@@ -1,4 +1,5 @@
 *.o
+*.exe
 
 .idea
 

Makefile

@@ -1,13 +1,17 @@
 CC := gcc # C Compiler
 CXX := g++ # C++ compiler
-I_FLAGS := -I"./include"
-L_FLAGS := -lmingw32 -static-libgcc
+I_FLAGS := -I"./include" -I"${SDL2_HOME}/include"
+L_FLAGS := -lmingw32 -lSDL2main -lSDL2_mixer -lSDL2 -static-libgcc
 C_FLAGS := -w -std=c++14 -Wfatal-errors
+LIBRARIES := -L"${SDL2_HOME}/lib"
 BUILD_OBJECT := roll_back_engine.exe
 TEST_BUILD_OBJECT := test_roll_back_engine.exe
 
 SRC = $(wildcard src/main.cpp src/core/*.cpp src/core/utils/*.cpp)
+SRC_C = $(wildcard lib/glad.c)
+
 OBJ = $(SRC:.cpp=.o)
+OBJ_C = $(SRC_C:.c=.o)
 
 TEST_SRC = $(wildcard src/test/*.cpp src/test/unit/*.cpp src/core/*.cpp src/core/utils/*.cpp)
 TEST_OBJ = $(TEST_SRC:.cpp=.o)
@@ -22,9 +26,13 @@ all: clean format build
 	@echo "Compiling " $< " into " $@
 	@$(CXX) -c $(C_FLAGS) $< -o $@ $(I_FLAGS)
 
-build: $(OBJ)
+%.o: %.c
+	@echo "Compiling " $< " into " $@
+	@$(CC) -c $(C_FLAGS) $< -o $@ $(I_FLAGS)
+
+build: $(OBJ) $(OBJ_C)
 	@echo "Linking " $@
-	@$(CXX) -o $(BUILD_OBJECT) $^ $(I_FLAGS) $(L_FLAGS)
+	@$(CXX) -o $(BUILD_OBJECT) $^ $(I_FLAGS) $(L_FLAGS) $(LIBRARIES)
 
 format:
 	astyle -n --style=google --recursive src/*.cpp src/*.h
@@ -41,9 +49,9 @@ run:
 # Tests
 test: build-test run-test
 
-build-test: $(TEST_OBJ)
+build-test: $(TEST_OBJ) $(OBJ_C)
 	@echo "Linking " $@
-	@$(CXX) -o $(TEST_BUILD_OBJECT) $^ $(I_FLAGS) $(L_FLAGS)
+	@$(CXX) -o $(TEST_BUILD_OBJECT) $^ $(I_FLAGS) $(L_FLAGS) $(LIBRARIES)
 
 clean-test:
 ifneq ("$(wildcard $(TEST_BUILD_OBJECT))","")