1 files changed, 1 insertions, 0 deletions
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 28425242e6..f02003fb27 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -1400,6 +1400,7 @@ site-install-rb: install-rb
     unless suffixes.empty?
       mfile.print ".SUFFIXES: .", suffixes.uniq.join(" ."), "\n\n"
     end
+    mfile.print "$(OBJS): $(RUBY_EXTCONF_H)\n\n" if $extconf_h
     mfile.print depout
   else
     headers = %w[ruby.h defines.h]