I noticed that the HEAD readline package wasn't linking against the GNUreadline framework (as distributed for Mac OS X on the ghc-6.6.1 downloads page). The following patch fixes that. I've tested it on OS X (both with and without the framework), but someone should probably double-check that it works fine on non-Mac systems. Also note that for this to work correctly, it requires a bugfix that I just sent to cvs-ghc: http://permalink.gmane.org/gmane.comp.lang.haskell.cvs.ghc/23055 Thank, -Judah * Link against GNUreadline.framework, if it's available. This can be overridden by setting --with-readline-includes or --with-readline-libraries. M ./HsReadline_cbits.c -2 +1 M ./configure.ac -20 +39 M ./include/HsReadline.h -1 +7 M ./readline.buildinfo.in +1