3 files changed, 23 insertions, 3 deletions
diff --git a/mrbgems/mruby-version/src/version.c b/mrbgems/mruby-version/src/version.c
index bfd971209..313f55b7e 100644
--- a/mrbgems/mruby-version/src/version.c
+++ b/mrbgems/mruby-version/src/version.c
@@ -8,6 +8,7 @@ mrb_mruby_version_gem_init(mrb_state* mrb)
   mrb_define_global_const(mrb, "MRUBY_VERSION", mrb_str_new_cstr(mrb, MRUBY_VERSION));
   mrb_define_global_const(mrb, "MRUBY_RELEASE_DATE", mrb_str_new_cstr(mrb, MRUBY_RELEASE_DATE));
   mrb_define_global_const(mrb, "MRUBY_DESCRIPTION", mrb_str_new_cstr(mrb, MRUBY_DESCRIPTION));
+  mrb_define_global_const(mrb, "MRUBY_COPYRIGHT", mrb_str_new_cstr(mrb, MRUBY_COPYRIGHT));
 }
 
 void
diff --git a/mrbgems/mruby-version/src/version.h b/mrbgems/mruby-version/src/version.h
index ee64036b7..5ca3f3d59 100644
--- a/mrbgems/mruby-version/src/version.h
+++ b/mrbgems/mruby-version/src/version.h
@@ -7,6 +7,19 @@
 #define MRUBY_RELEASE_MONTH 1
 #define MRUBY_RELEASE_DAY 10
 
-#define MRUBY_DESCRIPTION       \
-    "mruby "MRUBY_VERSION       \
+#define MRUBY_BIRTH_YEAR 2011
+
+#define MRUBY_AUTHOR "mruby developers"
+
+#define STRINGIZE0(expr) #expr
+#define STRINGIZE(expr) STRINGIZE0(expr)
+
+#define MRUBY_DESCRIPTION             \
+    "mruby "MRUBY_VERSION             \
     " ("MRUBY_RELEASE_DATE") " 
+#define MRUBY_COPYRIGHT               \
+    "mruby - Copyright (c) "          \
+    STRINGIZE(MRUBY_BIRTH_YEAR)"-"    \
+    STRINGIZE(MRUBY_RELEASE_YEAR)" "  \
+    MRUBY_AUTHOR
+
diff --git a/src/print.c b/src/print.c
index 44b2049db..30b983264 100644
--- a/src/print.c
+++ b/src/print.c
@@ -73,6 +73,12 @@ mrb_show_copyright(mrb_state *mrb)
   static const char copyright_msg[] = "mruby - Copyright (c) 2010-2014 mruby developers\n";
   mrb_value msg;
 
-  msg = mrb_str_new(mrb, copyright_msg, sizeof(copyright_msg) - 1);
+  if (mrb_const_defined(mrb, mrb_obj_value(mrb->object_class), mrb_intern_lit(mrb, "MRUBY_COPYRIGHT"))) {
+    msg = mrb_const_get(mrb, mrb_obj_value(mrb->object_class), mrb_intern_lit(mrb, "MRUBY_COPYRIGHT"));
+    msg = mrb_funcall(mrb, msg, "+", 1, mrb_str_new_cstr(mrb, "\n"));
+  }
+  else {
+    msg = mrb_str_new(mrb, copyright_msg, sizeof(copyright_msg) - 1);
+  }
   printstr(mrb, msg);
 }