--- ruby-1.9.3-p0/lib/mkmf.rb.debug	2011-08-11 15:07:37.000000000 +0900
+++ ruby-1.9.3-p0/lib/mkmf.rb	2012-01-29 21:34:17.000000000 +0900
@@ -1638,7 +1638,7 @@
 SHELL = /bin/sh
 
 # V=0 quiet, V=1 verbose.  other values don't work.
-V = 0
+V = 1
 Q1 = $(V:1=)
 Q = $(Q1:0=@)
 n=$(NULLCMD)