Ruby » Ruby master

configure.in: adjust libdirname

• configure.in (libdirname): adjust library path name which libruby
  files will be installed. [Bug #7874]
• tool/rbinstall.rb (libdir): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39333 b2dd03c8-39d4-4d8f-98ff-823fe69b080e