diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..9d03705
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+/build/
+/wschod
+/perf.data*
+/massif.out*
\ No newline at end of file
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..04b285a
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,40 @@
+# To launch with debug messages: G_MESSAGES_DEBUG=all ./librefront
+
+SRC     := $(shell find src -name '*.c')
+OBJ     := $(patsubst src/%.c, build/%.o, $(SRC))
+DEP     := $(OBJ:.o=.d)
+
+CC      := gcc
+LD      := gcc
+STD     := gnu23
+RM      := rm -f
+
+DEBUG   ?= 1
+
+CFLAGS  := -std=$(STD) -Werror -Wextra -Wall -MMD -MP `pkg-config --cflags sdl3 sdl3-image glib-2.0`
+LDFLAGS := -std=$(STD) -lm `pkg-config --libs sdl3 sdl3-image glib-2.0`
+
+TARGET  := librefront
+
+ifeq ($(DEBUG),1)
+	CFLAGS  += -g -DDEBUG
+	LDFLAGS += -g
+else
+	CFLAGS  += -O2 -DNDEBUG
+endif
+
+.PHONY: all clean
+
+all: $(TARGET)
+
+$(TARGET): $(OBJ)
+	$(LD) $^ -o $@ $(LDFLAGS)
+
+build/%.o: src/%.c
+	@mkdir -p $(dir $@)
+	$(CC) -c $< -o $@ $(CFLAGS)
+
+clean:
+	$(RM) -r build/ $(TARGET) $(OBJ) $(DEP) perf.data* massif.out*
+
+-include $(DEP)
diff --git a/README.md b/README.md
index 2b6ae0a..4c45445 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ Fast, multithreaded, multicore, GPU, CUDA, raytracing, NVIDIA game
 
 # TODOs
 
-- [ ] Basic SDL window open
+- [X] Basic SDL window open
 - [ ] Map structure programmed
 - [ ] Loading a map from a file
 - [ ] Displaying a map on the screen
diff --git a/shell.nix b/shell.nix
new file mode 100644
index 0000000..d0eb7cb
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1,19 @@
+let
+  nixpkgs = fetchTarball "https://github.com/NixOS/nixpkgs/tarball/nixos-25.05";
+  pkgs = import nixpkgs { config = {}; overlays = []; };
+in
+pkgs.mkShellNoCC {
+  packages = with pkgs; [
+    sdl3
+    sdl3-image
+    glib
+
+    gcc
+    pkg-config
+    cloc
+    valgrind
+    gdb
+    cpulimit
+    linuxKernel.packages.linux_6_12.perf    
+  ];
+}
diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..b6016fa
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,80 @@
+#define SDL_MAIN_USE_CALLBACKS 1
+#include <stdlib.h>
+#include <SDL3/SDL.h>
+#include <SDL3/SDL_main.h>
+#include <glib-2.0/glib.h>
+
+#include "util.h"
+
+SDL_Window *sdl_window;
+SDL_Renderer *sdl_renderer;
+
+SDL_AppResult
+SDL_AppInit (void **appstate, int argc, char **argv)
+{
+  UNUSED (appstate, argc, argv);
+
+  setenv ("GIO_USE_VFS", "local", 1);
+  setenv ("GSETTINGS_BACKEND", "memory", 1);
+  
+#ifdef DEBUG
+  setenv ("G_MESSAGES_DEBUG", "all", 1);
+#endif
+  
+  SDL_SetAppMetadata ("LibreFront", "0.1",
+		      "https://git.cfpi-fpsi.eu:8443/chopin-interactive/librefront");
+
+  if (!SDL_Init (SDL_INIT_VIDEO))
+    {
+      g_error ("Couldn't initialize SDL: %s", SDL_GetError ());
+    }
+
+  sdl_window = SDL_CreateWindow ("LibreFront", 800, 600, SDL_WINDOW_RESIZABLE);
+
+  if (!sdl_window)
+    {
+      g_error ("Couldn't create window: %s", SDL_GetError ());
+    }
+
+  sdl_renderer = SDL_CreateRenderer (sdl_window, NULL);
+
+  if (!sdl_renderer)
+    {
+      g_error ("Couldn't create renderer: %s", SDL_GetError ());
+    }
+  
+  return SDL_APP_CONTINUE;
+}
+
+SDL_AppResult
+SDL_AppEvent (void *appstate, SDL_Event *event)
+{
+  UNUSED (appstate);
+  
+  if (event->type == SDL_EVENT_QUIT)
+    {
+      return SDL_APP_SUCCESS;
+    }
+
+  return SDL_APP_CONTINUE;
+}
+
+SDL_AppResult
+SDL_AppIterate (void *appstate)
+{
+  UNUSED (appstate);
+
+  SDL_RenderClear (sdl_renderer);
+  SDL_RenderPresent (sdl_renderer);
+  
+  return SDL_APP_CONTINUE;
+}
+
+void
+SDL_AppQuit (void *appstate, SDL_AppResult result)
+{
+  UNUSED (appstate, result);
+
+  SDL_DestroyRenderer (sdl_renderer);
+  SDL_DestroyWindow (sdl_window);
+}
diff --git a/src/util.h b/src/util.h
new file mode 100644
index 0000000..a3dd55c
--- /dev/null
+++ b/src/util.h
@@ -0,0 +1,19 @@
+#pragma once
+
+#define UNUSED(...)                   (UNUSED_1 (__VA_ARGS__, 0))
+#define UNUSED_1(arg, ...) (void) arg, UNUSED_2 (__VA_ARGS__, 0)
+#define UNUSED_2(arg, ...) (void) arg, UNUSED_3 (__VA_ARGS__, 0)
+#define UNUSED_3(arg, ...) (void) arg
+
+/*
+
+  GLib log levels:
+
+  g_debug
+  g_info
+  g_message
+  g_warning
+  g_critical
+  g_error
+
+ */