Shall not pass 80 characters in width.

Makefile

@@ -15,16 +15,28 @@ endif
 CC = clang
 
 UFLAGS =
-FLAGS = -ansi -D_POSIX_C_SOURCE=200809L -pedantic -pedantic-errors -Wall -Wextra -fno-caret-diagnostics -fno-show-column -Wno-missing-field-initializers -Wno-unused-function -Wno-unused-parameter -Wno-unused-variable -Wno-unused-but-set-variable
-		# -pedantic-errors
+# NOTE: We comply with C89 (plain C), however the standard has no 64-bit
+#       support. But, every compiler at that time supported long long,
+#       hence we ignore the incompliance in our code.
+# NOTE: We allow function declrations with specifying void
+#       (ex, void test() is allowed).
+FLAGS = -ansi -pedantic -pedantic-errors -Wno-long-long \
+		-Wno-strict-prototypes -Wall -Wextra -fno-caret-diagnostics \
+		-fno-show-column -Wno-missing-field-initializers \
+		-Wno-unused-function -Wno-unused-parameter -Wno-unused-variable \
+		-Wno-unused-but-set-variable
 
 ifeq ($(DETECTED_OS),macos)
-	UFLAGS = -gldb
+	UFLAGS = -glldb
 	INCLUDE = -I./sdl/include/ 
 	LIBS = ./sdl/lib/arm-macos/libSDL2.a -lm
-	FRAMEWORKS = -framework Cocoa -framework IOKit -framework CoreAudio -framework AudioToolbox -framework ForceFeedback -framework Carbon -framework GameController -framework Metal -framework QuartzCore -framework CoreHaptics
+	FRAMEWORKS = -framework Cocoa -framework IOKit -framework CoreAudio \
+				 -framework AudioToolbox -framework ForceFeedback \
+				 -framework Carbon -framework GameController \
+				 -framework Metal -framework QuartzCore \
+				 -framework CoreHaptics
 else ifeq ($(DETECTED_OS),linux)
-	UFLAGS = -ggdb
+	UFLAGS = -ggdb -D_POSIX_C_SOURCE=200809L 
 	INCLUDE = -I./sdl/include/
 	LIBS = ./sdl/lib/x86_64-linux/libSDL2.a -lm -lX11
 	FRAMEWORKS = 
@@ -43,10 +55,12 @@ EXE=handmadehero
 default: libhandmade $(EXE)
 
 libhandmade: handmade.c
-	@ $(CC) $(FLAGS) $(UFLAGS) -fPIC -shared $(INCLUDE) $^ $(LIBS) $(FRAMEWORKS) -o libhandmade.so
+	@ $(CC) $(FLAGS) $(UFLAGS) -fPIC -shared $(INCLUDE) $^ $(LIBS) \
+		$(FRAMEWORKS) -o libhandmade.so
 
 $(EXE): sdl_handmade.c libhandmade
-	@ $(CC) $(FLAGS) $(UFLAGS) $(INCLUDE) sdl_handmade.c $(LIBS) $(FRAMEWORKS) -o $@
+	@ $(CC) $(FLAGS) $(UFLAGS) $(INCLUDE) sdl_handmade.c $(LIBS) \
+		$(FRAMEWORKS) -o $@
 
 run:
 	./$(EXE)