configure.in in 1.9.3. uses sed -E which does not work with gnu sed
This line in configure.in:
uses sed -E, which does not work with GNU sed. This is fixed in trunk with this patch:
merge revision(s) 37905: [Backport #8757]
* configure.in (opt-dir): don't use non portable flag -E of sed.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@44820 b2dd03c8-39d4-4d8f-98ff-823fe69b080e