This means that things like
⌃R for reverse history search don't work. More importantly to me, you can't use non-ASCII characters like Swedish "å", "ä" and "ö".
Compiling your own Ruby (with readline) is one solution. If you just want ctrl+R, macosxhints has another.
The solution I'm currently using is the work of jptix, a regular on the ##textmate IRC channel. He asked me to blog about it, so here it is.
Get MacPorts and install
readline (you must specify
+universal, even on Intel):
sudo port install readline +universal
Get the Ruby extension for
svn co http://svn.ruby-lang.org/repos/ruby/tags/v1_8_6_111/ext/readline/ readline
Apply a small patch to
curl http://pastie.textmate.org/pastes/168767/download | patch readline/extconf.rb
Compile and install the extension. You likely need the OS X developer tools, or have a C compiler from elsewhere:
sudo make install
All döne. Håppy häcking.