* doc/contributing.rdoc: fix configuration option.

[ci skip] [fix GH-1009]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51758 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Fri Sep  4 17:46:17 2015  SHIBATA Hiroshi  <hsbt@ruby-lang.org>
+
+	* doc/contributing.rdoc: fix configuration option.
+	  [ci skip] [fix GH-1009]
+
 Fri Sep  4 04:46:54 2015  Koichi Sasada  <ko1@atdot.net>
 
 	* iseq.c (iseq_memsize): functions for wrapper object should have

doc/contributing.rdoc

@@ -312,7 +312,7 @@ Now let's build CRuby:
     autoconf
     mkdir build && cd build # its good practice to build outside of source dir
     mkdir ~/.rubies # we will install to .rubies/ruby-trunk in our home dir
-    ../configure --prefix="$HOME/.rubies/ruby-trunk"
+    ../configure --prefix="${HOME}/.rubies/ruby-trunk"
     make && make install
 
 After adding Ruby to your PATH, you should be ready to run the test suite: