nobu	2013-01-08 11:18:46 +0900 (Tue, 08 Jan 2013)

  New Revision: 38737

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=38737

  Log:
    * README (install): note about distclean-ext.

  Modified files:
    trunk/README

Index: README
===================================================================
--- README	(revision 38736)
+++ README	(revision 38737)
@@ -132,6 +132,10 @@ This is what you need to do to compile a https://github.com/ruby/ruby/blob/trunk/README#L132
 If you fail to compile ruby, please send the detailed error report with
 the error log and machine/OS type, to help others.
 
+Some extension libraries may not get compiled because of lack of
+necessary external libraries and/or headers, then you will need to run
+'<tt>make distclean-ext</tt>' to remove old configuration after
+installing them in such case.
 
 == Copying
 

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