diff --git a/Gtkmm3/gtk84_grid/CMakeLists.txt b/Gtkmm3/gtk84_grid/CMakeLists.txt
new file mode 100644
index 0000000..8558a36
--- /dev/null
+++ b/Gtkmm3/gtk84_grid/CMakeLists.txt
@@ -0,0 +1,19 @@
+set(CMAKE_CXX_STANDARD 17)
+cmake_minimum_required(VERSION 3.0.0)
+project(gtk84 VERSION 0.1.0)
+
+include(CTest)
+enable_testing()
+
+set(CPACK_PROJECT_NAME ${PROJECT_NAME})
+set(CPACK_PROJECT_VERSION ${PROJECT_VERSION})
+
+include(CPack)
+
+find_package (PkgConfig REQUIRED)
+pkg_check_modules (GTKMM3 REQUIRED gtkmm-3.0)
+include_directories (${GTKMM3_INCLUDE_DIRS})
+link_directories (${GTKMM3_LIBRARY_DIRS})
+add_executable(gtk84 src/main.cc src/MyWin.cc)
+add_definitions (${GTKMM3_CFLAGS_OTHER})
+target_link_libraries (${PROJECT_NAME} ${GTKMM3_LIBRARIES})
diff --git a/Gtkmm3/gtk83_grid/CMakeLists.txt b/Gtkmm3/gtk84_grid/CMakeLists.txt~
similarity index 100%
rename from Gtkmm3/gtk83_grid/CMakeLists.txt
rename to Gtkmm3/gtk84_grid/CMakeLists.txt~
diff --git a/Gtkmm3/gtk83_grid/build_mingw.cmd b/Gtkmm3/gtk84_grid/build_mingw.cmd
similarity index 100%
rename from Gtkmm3/gtk83_grid/build_mingw.cmd
rename to Gtkmm3/gtk84_grid/build_mingw.cmd
diff --git a/Gtkmm3/gtk83_grid/src/MyBtn.hh b/Gtkmm3/gtk84_grid/src/MyBtn.hh
similarity index 100%
rename from Gtkmm3/gtk83_grid/src/MyBtn.hh
rename to Gtkmm3/gtk84_grid/src/MyBtn.hh
diff --git a/Gtkmm3/gtk83_grid/src/MyWin.cc b/Gtkmm3/gtk84_grid/src/MyWin.cc
similarity index 100%
rename from Gtkmm3/gtk83_grid/src/MyWin.cc
rename to Gtkmm3/gtk84_grid/src/MyWin.cc
diff --git a/Gtkmm3/gtk83_grid/src/MyWin.hh b/Gtkmm3/gtk84_grid/src/MyWin.hh
similarity index 100%
rename from Gtkmm3/gtk83_grid/src/MyWin.hh
rename to Gtkmm3/gtk84_grid/src/MyWin.hh
diff --git a/Gtkmm3/gtk83_grid/src/main.cc b/Gtkmm3/gtk84_grid/src/main.cc
similarity index 100%
rename from Gtkmm3/gtk83_grid/src/main.cc
rename to Gtkmm3/gtk84_grid/src/main.cc