diff --git a/ChangeLog b/ChangeLog
index c17bb68d83..9809b47242 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Thu Jun  9 18:12:42 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* Makefile.in (un-runnable): fail with proper error message.
+	  [ruby-core:75905] [Bug #12472]
+
 Thu Jun  9 15:32:17 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* common.mk (RBCONFIG): use ifchange tool to see if the content is
diff --git a/Makefile.in b/Makefile.in
index 60fb44fd90..3550433690 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -563,3 +563,7 @@ loadpath: verconf.h
 	@$(CPP) $(XCFLAGS) $(CPPFLAGS) $(srcdir)/loadpath.c | \
 	sed -e '1,/^const char ruby_initial_load_paths/d;/;/,$$d' \
 	    -e '/^ /!d;s/ *"\\0"$$//;s/" *"//g'
+
+un-runnable:
+	$(ECHO) cannot make runnable, configure with --enable-load-relative.
+	$(Q) exit 1