add readline-5 that is still used for GPL2 only softwares.

component/readline/buildout.cfg

 [buildout]
 parts =
+  readline5
   readline
 extends =
   ../ncurses/buildout.cfg
 
+# readline-5.x is still used for GPL2 only softwares.
+[readline5]
+recipe = hexagonit.recipe.cmmi
+url = http://ftp.gnu.org/gnu/readline/readline-5.2.tar.gz
+md5sum = e39331f32ad14009b9ff49cc10c5e751
+configure-options =
+  --enable-multibyte
+  --disable-static
+  --with-ncurses=${ncurses:location}
+environment =
+    LDFLAGS =-Wl,-rpath=${ncurses:location}/lib
+
 [readline]
 recipe = hexagonit.recipe.cmmi
 url = http://ftp.gnu.org/gnu/readline/readline-6.2.tar.gz