4 files changed, 34 insertions, 0 deletions
diff --git a/doc/mrbgems/c_extension_example/Makefile b/doc/mrbgems/c_extension_example/Makefile
new file mode 100644
index 000000000..339669970
--- /dev/null
+++ b/doc/mrbgems/c_extension_example/Makefile
@@ -0,0 +1,10 @@
+GEM := c_extension_example
+
+include $(MAKEFILE_4_GEM)
+
+GEM_C_FILES := $(wildcard $(SRC_DIR)/*.c)
+GEM_OBJECTS := $(patsubst %.c, %.o, $(GEM_C_FILES))
+
+gem-all : $(GEM_OBJECTS) gem-c-files
+
+gem-clean : gem-clean-c-files
diff --git a/doc/mrbgems/c_extension_example/README.md b/doc/mrbgems/c_extension_example/README.md
new file mode 100644
index 000000000..3803c2065
--- /dev/null
+++ b/doc/mrbgems/c_extension_example/README.md
@@ -0,0 +1,4 @@
+C Extension Example
+=========
+
+This is an example gem which implements a C extension.
diff --git a/doc/mrbgems/c_extension_example/src/example.c b/doc/mrbgems/c_extension_example/src/example.c
new file mode 100644
index 000000000..9f0b07839
--- /dev/null
+++ b/doc/mrbgems/c_extension_example/src/example.c
@@ -0,0 +1,17 @@
+#include <mruby.h>
+#include <stdio.h>
+
+static struct RClass *_class_cextension;
+
+static mrb_value
+mrb_c_method(mrb_state *mrb, mrb_value self)
+{
+  puts("A C Extension");
+  return self;
+}
+
+void
+mrb_c_extension_example_gem_init(mrb_state* mrb) {
+  _class_cextension = mrb_define_module(mrb, "CExtension");
+  mrb_define_class_method(mrb, _class_cextension, "c_method", mrb_c_method, ARGS_NONE());
+}
diff --git a/doc/mrbgems/c_extension_example/test/example.rb b/doc/mrbgems/c_extension_example/test/example.rb
new file mode 100644
index 000000000..367d18029
--- /dev/null
+++ b/doc/mrbgems/c_extension_example/test/example.rb
@@ -0,0 +1,3 @@
+assert('C Extension Example') do
+  CExtension.respond_to? :c_method
+end