diff --git a/flake.nix b/flake.nix
index a7649ae..2c5af73 100755
--- a/flake.nix
+++ b/flake.nix
@@ -32,14 +32,18 @@
 
             buildInputs = with pkgs; [
                 glfw
+                glew
             ];
 
             buildPhase = ''
                 g++ \
                 src/*.cpp \
+                utils/Window/*.cpp utils/Window/WindowGLFW/*.cpp \
+                utils/Renderer/*.cpp utils/Renderer/RendererOpenGL/*.cpp \
                 -I src -I include -I utils \
                 -DRENDERER_OPENGL \
                 -DWINDOW_GLFW \
+                -lGL -lglfw -lGLEW \
                 -Wall \
                 -o $name 
             ''; 
@@ -182,20 +186,22 @@
 
             buildInputs = with pkgs; [
                 glfw
+                glew
             ];
 
             buildPhase = ''
                 g++ \
                 modules/TestImgui/src/*.cpp src/App.cpp \
                 $imgui/backends/imgui_impl_glfw.cpp \
-                $imgui/backends/imgui_impl_opengl.cpp \
+                $imgui/backends/imgui_impl_opengl3.cpp \
+                $imgui/*.cpp \
                 utils/Renderer/*.cpp utils/Renderer/RendererOpenGL/*.cpp \
                 utils/Window/*.cpp utils/Window/WindowGLFW/*.cpp \
                 -DRENDERER_OPENGL \
                 -DWINDOW_GLFW \
                 -fpic -shared \
-                -I src -I include \
-                -I utils \
+                -I src -I include -I utils -I $imgui \
+                -lGL -lglfw -lGLEW \
                 -Wall \
                 -o $name 
             ''; 
diff --git a/utils/Window/WindowGLFW/WindowGLFW.cpp b/utils/Window/WindowGLFW/WindowGLFW.cpp
index 6c1e81d..3700fbd 100644
--- a/utils/Window/WindowGLFW/WindowGLFW.cpp
+++ b/utils/Window/WindowGLFW/WindowGLFW.cpp
@@ -32,6 +32,10 @@ namespace Archimedes {
         glfwSwapBuffers(w);
     }
 
+    void WindowGLFW::getSize(int& w, int& h) {
+        glfwGetFramebufferSize(this->w, &w, &h);
+    }
+
     WindowGLFW::~WindowGLFW() {
         glfwTerminate();
     }