Ruby1.9.1をコンパイルしようとした

$ ./configure --enable-shared --enable-pthread --with-readline-dir=/usr/local
(略)
configure: WARNING: unrecognized options: --with-readline-dir

$ make test
(略)
#225 test_io.rb:11:in `<top (required)>': 
     begin
       require "io/nonblock"
       r, w = IO.pipe
       w.nonblock = true
       w.write_nonblock("a" * 100000)
       w.nonblock = false
       t1 = Thread.new { w.write("b" * 4096) }
       t2 = Thread.new { w.write("c" * 4096) }
       sleep 0.5
       r.sysread(4096).length
       sleep 0.5
       r.sysread(4096).length
       t1.join
       t2.join
     rescue LoadError
     end
  #=> not finished in 10 seconds  [ruby-dev:32566]
FAIL 1/934 tests failed
make: *** [btest-ruby] Error 1

ぎゃーす．