actualitzat a SDL3

Makefile

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+# Makefile sin espacios adicionales y con sintaxis minimalista
+CXXFLAGS:=-std=c++20 -Wall -Os -ffunction-sections -fdata-sections
+LDFLAGS:=-lSDL3
+SOURCE:=demo1_pixels_wave.cpp
+EXECUTABLE:=demo1_pixels_wave
+RM:=rm -f
+
+# Detectar plataforma
+ifeq ($(OS),Windows_NT)
+	PLATFORM:=windows
+	LDFLAGS+=-lmingw32 -lws2_32
+	EXE_EXT:=.exe
+else
+	UNAME_S:=$(shell uname -s)
+ifeq ($(UNAME_S),Linux)
+	PLATFORM:=linux
+	EXE_EXT:=.out
+endif
+ifeq ($(UNAME_S),Darwin)
+	PLATFORM:=macos
+	EXE_EXT:=.out
+endif
+endif
+
+# Regla principal
+all: $(EXECUTABLE)
+
+# Compilar
+$(EXECUTABLE):
+	$(CXX) $(SOURCE) $(CXXFLAGS) $(LDFLAGS) -o $(EXECUTABLE)$(EXE_EXT)
+
+# Limpiar
+clean:
+	$(RM) $(EXECUTABLE)*