diff --git a/CMakeLists.txt b/CMakeLists.txt
index 40bb7b2..3221c63 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,12 +1,21 @@
 project(cpplab)
 cmake_minimum_required(VERSION 3.10)
 
+FIND_PACKAGE(GTK)
+
+IF(GTK_FOUND)
+   INCLUDE_DIRECTORIES(${GTK_INCLUDE_DIR})
+   ADD_EXECUTABLE(my_gtk_exe my_gtk_exe.cxx)
+   TARGET_LINK_LIBRARIES(my_gtk_exe ${GTK_LIBRARIES})
+ENDIF(GTK_FOUND)
+
+
 set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
 
 #Set c++ c11 version
-set (CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD 11)
 
 add_subdirectory(src)
 add_subdirectory(include)
@@ -21,4 +30,5 @@ set(CPACK_GENERATOR "STGZ;TGZ;TZ;DEB")
 SET(CPACK_PACKAGE_DESCRIPTION_SUMMARY "CppLab")
 SET(CPACK_RESOURCE_FILE_LICENSE "${CMAKE_SOURCE_DIR}/LICENSE.txt")
 set(CPACK_PACKAGE_DESCRIPTION_FILE "${CMAKE_SOURCE_DIR}/README.md")
+
 include(CPack)
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 35972e7..c83fd5c 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -2,4 +2,5 @@ add_subdirectory(bmath)
 add_subdirectory(cpu)
 add_subdirectory(dtstruct)
 add_subdirectory(opengl)
-add_subdirectory(misc)
\ No newline at end of file
+add_subdirectory(misc)
+add_subdirectory(gui)
\ No newline at end of file
diff --git a/src/gui/CMakeLists.txt b/src/gui/CMakeLists.txt
new file mode 100644
index 0000000..c2916fc
--- /dev/null
+++ b/src/gui/CMakeLists.txt
@@ -0,0 +1,12 @@
+FIND_PACKAGE(GTK)
+FIND_PACKAGE(GDK)
+
+IF(GTK_FOUND)
+    message(STATUS "GTK found compiling GUI apps")
+    ADD_DEFINITIONS(${GTK3_CFLAGS_OTHER})
+    ADD_EXECUTABLE(gtk1 gtk1.cpp)
+    INCLUDE_DIRECTORIES(${GTK_INCLUDE_DIR})
+    TARGET_LINK_LIBRARIES(gtk1 ${GTK_LIBRARIES})
+ELSE()
+    message(STATUS "GTK not found.")
+ENDIF(GTK_FOUND)
\ No newline at end of file
diff --git a/src/gui/gtk1.cpp b/src/gui/gtk1.cpp
new file mode 100644
index 0000000..8b10940
--- /dev/null
+++ b/src/gui/gtk1.cpp
@@ -0,0 +1,23 @@
+// Include gtk
+//#include <gtk/gtk.h>
+#include <gtk-2.0/gdk/gdk.h>
+#include <gtk-2.0/gtk/gtk.h>
+
+static void on_activate (GtkApplication *app) {
+  // Create a new window
+  GtkWidget *window = gtk_application_window_new (app);
+  // Create a new button
+  GtkWidget *button = gtk_button_new_with_label ("Hello, World!");
+  // When the button is clicked, close the window passed as an argument
+  g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_window_close), window);
+  gtk_window_set_child (GTK_WINDOW (window), button);
+  gtk_window_present (GTK_WINDOW (window));
+}
+
+int main (int argc, char *argv[]) {
+  // Create a new application
+  GtkApplication *app = gtk_application_new ("com.example.GtkApplication",
+                                             G_APPLICATION_FLAGS_NONE);
+  g_signal_connect (app, "activate", G_CALLBACK (on_activate), NULL);
+  return g_application_run (G_APPLICATION (app), argc, argv);
+}