From 1735969296836546e5aa4672ec21dd6cae325f96 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Tue, 1 May 2012 06:52:25 +0000
Subject: extconf.h dependency

* lib/mkmf.rb (MakeMakefile#depend_rules): deal with extconf.h
  dependency.  just remove it and bail out right now.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@35510 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 lib/mkmf.rb | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 53f647aef1..4c05ebf8a5 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -1897,7 +1897,14 @@ RULES
     unless suffixes.empty?
       depout.unshift(".SUFFIXES: ." + suffixes.uniq.join(" .") + "\n\n")
     end
-    depout.unshift("$(OBJS): $(RUBY_EXTCONF_H)\n\n") if $extconf_h
+    if $extconf_h
+      depout.unshift("$(OBJS): $(RUBY_EXTCONF_H)\n\n",
+                     "$(RUBY_EXTCONF_H): $(srcdir)/extconf.rb\n",
+                     "$(RUBY_EXTCONF_H):\n",
+                     "\t$(Q)$(RM) $(@)\n",
+                     "\t$(ECHO) $@ is outdated, re-configure\n",
+                     "\t@exit 1\n")
+    end
     depout.flatten!
     depout
   end
-- 
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