diff --git a/.gitignore b/.gitignore
index 3ffde7df0..f28a84016 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,3 @@
-Makefile
 gem_*
 gem-*
 mrb-*.a
diff --git a/Makefile b/Makefile
new file mode 100644
index 000000000..80868955b
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,14 @@
+GEM := mruby-dir
+
+include $(MAKEFILE_4_GEM)
+
+GEM_C_FILES := $(wildcard $(SRC_DIR)/*.c)
+GEM_OBJECTS := $(patsubst %.c, %.o, $(GEM_C_FILES))
+
+GEM_RB_FILES := $(wildcard $(MRB_DIR)/*.rb)
+
+gem-all : $(GEM_OBJECTS) gem-c-and-rb-files
+
+gem-clean : gem-clean-c-and-rb-files
+
+gem-test : gem-test-c-and-rb-files