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curl -O ftp://ftp.gnu.org/gnu/readline/readline-6.2.tar.gz
tar xzvf readline-6.2.tar.gz
cd readline-6.2
./configure –prefix=/usr/local
cd shlib
sed -e ‘s/-dynamic/-dynamiclib/’ Makefile > Makefile.good
mv Makefile.good Makefile
cd ..
make
sudo make install
make
sudo make install
cd ..

I got this

gcc-4.2 -dynamic -arch_only `/usr/bin/arch` -install_name /usr/local/lib/libreadline.6.1.dylib -current_version 6.1 -compatibility_version 6 -v -o libreadline.6.1.dylib readline.so vi_mode.so funmap.so keymaps.so parens.so search.so rltty.so complete.so bind.so isearch.so display.so signals.so util.so kill.so undo.so macro.so input.so callback.so terminal.so text.so nls.so misc.so xmalloc.so history.so histexpand.so histfile.so histsearch.so shell.so mbutil.so tilde.so compat.so -lncurses
Using built-in specs.
Target: i686-apple-darwin11
Configured with: /private/var/tmp/gcc/gcc-5666.3~278/src/configure –disable-checking –enable-werror –prefix=/usr –mandir=/share/man –enable-languages=c,objc,c++,obj-c++ –program-transform-name=/^[cg][^.-]*$/s/$/-4.2/ –with-slibdir=/usr/lib –build=i686-apple-darwin11 –program-prefix=i686-apple-darwin11- –host=x86_64-apple-darwin11 –target=i686-apple-darwin11 –with-gxx-include-dir=/include/c++/4.2.1
Thread model: posix
gcc version 4.2.1 (Apple Inc. build 5666) (dot 3)
i686-apple-darwin11-gcc-4.2.1: -compatibility_version only allowed with -dynamiclib
make[1]: *** [libreadline.6.1.dylib] Error 1
make: [shared] Error 2 (ignored)