diff --git a/meson.build b/meson.build
index ba4c976..099ab4b 100644
--- a/meson.build
+++ b/meson.build
@@ -1,3 +1,11 @@
 project('memoserv', 'cpp', default_options:['debug=true', 'cpp_std=c++17', 'b_ndebug=if-release'])
 
+is_debug_build = 0
+if get_option('buildtype').startswith('debug')
+  is_debug_build = 1
+endif
+
+memcard_proj = subproject('memcard')
+memcard_dep = memcard_proj.get_variable('memcard_dep')
+
 subdir('src/gui')
diff --git a/src/gui/main.cpp b/src/gui/main.cpp
index ad316c9..a9d856c 100644
--- a/src/gui/main.cpp
+++ b/src/gui/main.cpp
@@ -1,4 +1,4 @@
-#include "memorycard.hpp"
+#include "memcard/memorycard.hpp"
 #include "widget/block_grid.hpp"
 #include "make_nana_animation.hpp"
 #include <nana/gui.hpp>
diff --git a/src/gui/make_nana_animation.cpp b/src/gui/make_nana_animation.cpp
index 6d455b6..bc58666 100644
--- a/src/gui/make_nana_animation.cpp
+++ b/src/gui/make_nana_animation.cpp
@@ -1,6 +1,6 @@
 #include "make_nana_animation.hpp"
-#include "block.hpp"
-#include "icon_fetch.hpp"
+#include "memcard/block.hpp"
+#include "memcard/icon_fetch.hpp"
 
 namespace duck {
 	AnimationWithSize make_nana_animation (const ConstBlock& block, int width, int height, int fps) {
diff --git a/src/gui/meson.build b/src/gui/meson.build
index 6302db6..c6b533a 100644
--- a/src/gui/meson.build
+++ b/src/gui/meson.build
@@ -21,18 +21,9 @@ libxft_dep = dependency('xft')
 libfontconfig_dep = dependency('fontconfig')
 libthread_dep = dependency('threads')
 
-is_debug_build = 0
-if get_option('buildtype').startswith('debug')
-  is_debug_build = 1
-endif
-
 executable('gui',
   'main.cpp',
-  'memorycard.cpp',
-  'block.cpp',
-  'icon_fetch.cpp',
   'widget/block_grid.cpp',
-  'resize_harris.cpp',
   'make_nana_animation.cpp',
   'animation_with_size.cpp',
   dependencies: [
@@ -43,6 +34,7 @@ executable('gui',
 	libxft_dep,
 	libfontconfig_dep,
 	libthread_dep,
+	memcard_dep,
   ],
   install: true,
   include_directories: [private_incl] + nana_incl_search,
diff --git a/src/gui/widget/block_grid.cpp b/src/gui/widget/block_grid.cpp
index 47956ed..397d3bf 100644
--- a/src/gui/widget/block_grid.cpp
+++ b/src/gui/widget/block_grid.cpp
@@ -1,7 +1,7 @@
 #include "widget/block_grid.hpp"
-#include "memorycard.hpp"
-#include "block.hpp"
-#include "icon_fetch.hpp"
+#include "memcard/memorycard.hpp"
+#include "memcard/block.hpp"
+#include "memcard/icon_fetch.hpp"
 #include <cassert>
 #include <algorithm>
 #include <nana/gui/detail/widget_content_measurer_interface.hpp>
diff --git a/src/meson.build b/src/meson.build
new file mode 100644
index 0000000..7b350d7
--- /dev/null
+++ b/src/meson.build
@@ -0,0 +1 @@
+subdir('gui')
diff --git a/src/gui/block.hpp b/subprojects/memcard/include/memcard/block.hpp
similarity index 100%
rename from src/gui/block.hpp
rename to subprojects/memcard/include/memcard/block.hpp
diff --git a/src/gui/icon_fetch.hpp b/subprojects/memcard/include/memcard/icon_fetch.hpp
similarity index 81%
rename from src/gui/icon_fetch.hpp
rename to subprojects/memcard/include/memcard/icon_fetch.hpp
index 10d8c24..f5ca745 100644
--- a/src/gui/icon_fetch.hpp
+++ b/subprojects/memcard/include/memcard/icon_fetch.hpp
@@ -1,6 +1,6 @@
 #pragma once
 
-#include "block.hpp"
+#include "memcard/block.hpp"
 #include <vector>
 
 std::vector<std::vector<char>> icon_fetch (const ConstBlock& block, int width, int height);
diff --git a/src/gui/memorycard.hpp b/subprojects/memcard/include/memcard/memorycard.hpp
similarity index 100%
rename from src/gui/memorycard.hpp
rename to subprojects/memcard/include/memcard/memorycard.hpp
diff --git a/subprojects/memcard/meson.build b/subprojects/memcard/meson.build
new file mode 100644
index 0000000..7be88e2
--- /dev/null
+++ b/subprojects/memcard/meson.build
@@ -0,0 +1,19 @@
+project('memcard', 'cpp', default_options:['debug=true', 'cpp_std=c++17', 'b_ndebug=if-release'])
+add_project_link_arguments(['-lstdc++fs'], language: 'cpp')
+
+private_incl = include_directories('src')
+library_incl = include_directories('include')
+
+memcard = shared_library('memcard',
+  'src/memorycard.cpp',
+  'src/block.cpp',
+  'src/icon_fetch.cpp',
+  'src/resize_harris.cpp',
+  install: true,
+  include_directories: [private_incl, library_incl],
+)
+
+memcard_dep = declare_dependency(
+  include_directories: library_incl,
+  link_with: memcard
+)
diff --git a/src/gui/block.cpp b/subprojects/memcard/src/block.cpp
similarity index 97%
rename from src/gui/block.cpp
rename to subprojects/memcard/src/block.cpp
index 2d46aca..b932291 100644
--- a/src/gui/block.cpp
+++ b/subprojects/memcard/src/block.cpp
@@ -1,5 +1,5 @@
-#include "block.hpp"
-#include "memorycard.hpp"
+#include "memcard/block.hpp"
+#include "memcard/memorycard.hpp"
 #include <cassert>
 #include <iomanip>
 #include <iostream>
diff --git a/src/gui/icon_fetch.cpp b/subprojects/memcard/src/icon_fetch.cpp
similarity index 99%
rename from src/gui/icon_fetch.cpp
rename to subprojects/memcard/src/icon_fetch.cpp
index 44c21ee..822be0f 100644
--- a/src/gui/icon_fetch.cpp
+++ b/subprojects/memcard/src/icon_fetch.cpp
@@ -1,4 +1,4 @@
-#include "icon_fetch.hpp"
+#include "memcard/icon_fetch.hpp"
 #include "resize_harris.hpp"
 #include <cstdint>
 #include <cassert>
diff --git a/src/gui/memorycard.cpp b/subprojects/memcard/src/memorycard.cpp
similarity index 92%
rename from src/gui/memorycard.cpp
rename to subprojects/memcard/src/memorycard.cpp
index cb5ffe6..172cb90 100644
--- a/src/gui/memorycard.cpp
+++ b/subprojects/memcard/src/memorycard.cpp
@@ -1,5 +1,5 @@
-#include "memorycard.hpp"
-#include "block.hpp"
+#include "memcard/memorycard.hpp"
+#include "memcard/block.hpp"
 #include <algorithm>
 #include <iterator>
 #include <cassert>
diff --git a/src/gui/resize_harris.cpp b/subprojects/memcard/src/resize_harris.cpp
similarity index 100%
rename from src/gui/resize_harris.cpp
rename to subprojects/memcard/src/resize_harris.cpp
diff --git a/src/gui/resize_harris.hpp b/subprojects/memcard/src/resize_harris.hpp
similarity index 100%
rename from src/gui/resize_harris.hpp
rename to subprojects/memcard/src/resize_harris.hpp