diff --git a/app/WM/Core.hs b/app/WM/Core.hs
index be3e72b..dce4b5b 100644
--- a/app/WM/Core.hs
+++ b/app/WM/Core.hs
@@ -1,17 +1,25 @@
 module WM.Core where
 
 import Control.Concurrent (threadDelay)
+import Control.Exception (bracket)
 import Foreign (Ptr)
 import System.Environment (getArgs)
 import WM.Mruby
 import WM.XKutu
 
 data State = State
-  { mruby_pointer :: Ptr MrbState,
-    running :: Bool
+  { mruby_pointer :: !(Ptr MrbState),
+    running :: !Bool
   }
   deriving (Show)
 
+newState :: Ptr MrbState -> State
+newState ptr =
+  State
+    { mruby_pointer = ptr,
+      running = True
+    }
+
 run :: IO ()
 run = do
   is_started <- deploy
@@ -24,11 +32,10 @@ run = do
   print screen_info
   pointer_info <- get_pointer
   print pointer_info
-  mrb <- mrb_open
-  runRuby mrb runtimeRb
-  handle_args mrb
-  loop $ State mrb True
-  mrb_close mrb
+  bracket mrb_open mrb_close $ \mrb -> do
+    loadRubyLibs mrb
+    handle_args mrb
+    loop (newState mrb)
 
 handle_args :: Ptr MrbState -> IO ()
 handle_args mrb = do
@@ -41,12 +48,10 @@ handle_args mrb = do
     _ -> putStrLn "unknown arguments"
 
 handle_event :: Maybe Event -> State -> IO State
-handle_event Nothing state = pure state
-handle_event (Just ev) state
-  | event_btn ev == 24 = pure state {running = False}
-  | otherwise = do
-      print ev
-      pure state
+handle_event Nothing s = pure s
+handle_event (Just ev) s
+  | event_btn ev == 24 = pure s {running = False}
+  | otherwise = print ev >> pure s
 
 loop :: State -> IO ()
 loop state
diff --git a/app/WM/Mruby.hs b/app/WM/Mruby.hs
index 4a5f7e0..47cee43 100644
--- a/app/WM/Mruby.hs
+++ b/app/WM/Mruby.hs
@@ -1,20 +1,11 @@
 {-# LANGUAGE CApiFFI #-}
 {-# LANGUAGE ForeignFunctionInterface #-}
-{-# LANGUAGE TemplateHaskell #-}
 
 module WM.Mruby where
 
-import Data.FileEmbed (embedFile)
-import Data.Text qualified as T
-import Data.Text.Encoding qualified as TE
-import Data.Text.Encoding.Error qualified as TEE
-import Foreign.C (CString, withCString)
+import Foreign.C (CChar, CInt (CInt), CString, withCString)
 import Foreign.Ptr
 
-runtimeRb :: String
-runtimeRb =
-  T.unpack (TE.decodeUtf8With TEE.lenientDecode $(embedFile "./app/ruby/lib.rb"))
-
 data MrbState
 
 foreign import capi "mruby.h mrb_open"
@@ -30,3 +21,15 @@ runRuby :: Ptr MrbState -> String -> IO ()
 runRuby mrb code =
   withCString code $ \cstr ->
     c_mrb_load_string mrb cstr
+
+foreign import capi "ruby_compiled.h value mgems"
+  c_mgems :: Ptr CChar
+
+foreign import capi "ruby_compiled.h value mgems_len"
+  c_mgems_len :: CInt
+
+foreign import capi "mruby/irep.h mrb_load_irep_buf"
+  c_mrb_load_irep_buf :: Ptr MrbState -> Ptr CChar -> CInt -> IO ()
+
+loadRubyLibs :: Ptr MrbState -> IO ()
+loadRubyLibs mrb = c_mrb_load_irep_buf mrb c_mgems c_mgems_len
diff --git a/app/ruby/lib.rb b/app/ruby/lib.rb
deleted file mode 100644
index 1753755..0000000
--- a/app/ruby/lib.rb
+++ /dev/null
@@ -1 +0,0 @@
-puts "hello from library"
diff --git a/app/ruby/main.rb b/app/ruby/main.rb
deleted file mode 100644
index 30a0d6e..0000000
--- a/app/ruby/main.rb
+++ /dev/null
@@ -1 +0,0 @@
-puts "hello from ruby"
diff --git a/config/config.rb b/config/config.rb
new file mode 100644
index 0000000..b209fbd
--- /dev/null
+++ b/config/config.rb
@@ -0,0 +1 @@
+puts "hello from config"
diff --git a/flake.nix b/flake.nix
index 1b824c1..2076392 100644
--- a/flake.nix
+++ b/flake.nix
@@ -35,6 +35,7 @@
 
             gnumake
             ruby
+            xxd
 
             haskellPackages.ghc
             haskellPackages.cabal-install
diff --git a/kutu.cabal b/kutu.cabal
index a4c1492..33e791f 100644
--- a/kutu.cabal
+++ b/kutu.cabal
@@ -24,7 +24,7 @@ executable kutu
         WM.XKutu
         WM.Mruby
 
-    build-depends:    base, extra, bytestring, file-embed, text
+    build-depends:    base, bytestring
 
     hs-source-dirs:   app
 
diff --git a/libs/l_mgems/compile.sh b/libs/l_mgems/compile.sh
index 0d62ef4..78e1062 100644
--- a/libs/l_mgems/compile.sh
+++ b/libs/l_mgems/compile.sh
@@ -4,7 +4,7 @@ set -e
 
 SCRIPT_DIR="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
 OUTPUT_TMP=$(mktemp)
-OUTPUT="$SCRIPT_DIR/../../include/binding/ruby_compiled.h"
+OUTPUT="$SCRIPT_DIR/../../app/c/ruby_compiled.h"
 
 if test "$1" = "clean"; then
   rm -f "$OUTPUT"
@@ -32,9 +32,9 @@ fi
   echo "#ifndef MGEMS_H"
   echo "#define MGEMS_H"
   xxd -i -n mgems $OUTPUT_TMP \
-     | sed -e 's/^unsigned char /constexpr unsigned char /' \
-           -e 's/^unsigned int /constexpr unsigned int /'
+     | sed -e 's/^unsigned char /unsigned char /' \
+           -e 's/^unsigned int /unsigned int /'
   echo "#endif"
 } > "$OUTPUT"
 
-echo "Compiled mgems!"
\ No newline at end of file
+echo "Compiled mgems!"
diff --git a/libs/l_mgems/lib.rb b/libs/l_mgems/lib.rb
new file mode 100644
index 0000000..2af6890
--- /dev/null
+++ b/libs/l_mgems/lib.rb
@@ -0,0 +1 @@
+puts "hello from lib"
diff --git a/libs/l_mgems/pp.rb b/libs/l_mgems/pp.rb
index a931f61..3cdc021 100644
--- a/libs/l_mgems/pp.rb
+++ b/libs/l_mgems/pp.rb
@@ -1007,4 +1007,4 @@ class Object < BasicObject # :nodoc:
       end
     }
   }
-end
\ No newline at end of file
+end