Update gitignore and minor fixes

package.nix

@@ -31,7 +31,13 @@ stdenv.mkDerivation {
   ];
 
   buildPhase = ''
-    ./setup.sh
+    mkdir -p build
+
+    gcc -shared -fPIC \
+      -Wall -Wextra \
+      -o build/X-kutu.so \
+      src/c/X-kutu.c \
+      $(pkg-config --libs --cflags xcb xcb-icccm);
   '';
 
   installPhase = ''
@@ -43,7 +49,7 @@ stdenv.mkDerivation {
     cp bin/kutu-run.rb $out/bin/kutu-run.rb
 
     cp build/X-kutu.so $out/build/
-    cp -r src $out/src
+    cp -r src/. $out/src/
 
     wrapProgram $out/bin/kutu.rb \
       --prefix PATH : ${lib.makeBinPath [