[Haskell-cafe] Can't cabal install readline

[Martijn van Steenbergen]

Hello,

This week I upgraded to GHC 6.10 using the .pkg installer. It installed 
without a single hiccup -- thanks!

I've noticed two odd things: the standard library haddock that comes 
with the installer doesn't have links to the hs-coloured sources anymore 
(and neither does the online documentation); I miss that a lot. I also 
can't Ctrl+R anymore in GHCi to search my command history. But I can 
learn to live without those.

Another minor inconvenience is that the packages I had installed (using 
  cabal) are no longer available to GHC -- I think I will have to 
reinstall them. But I cannot continue working on my Yogurt project 
anymore, because it depends on readline, which fails to build:

<snip>
checking for rl_readline_version... yes
checking for rl_begin_undo_group... no
configure: error: readline not found, so this package cannot be built
See `config.log' for more details.
cabal: Error: some packages failed to install:
Yogurt-0.2 depends on readline-1.0.1.0 which failed to install.
readline-1.0.1.0 failed during the configure step. The exception was:
exit: ExitFailure 1

The build failure mentions config.log which I cannot find anywhere on my 
system. I have readline installed using MacPorts without problems, and 
the cabal package worked fine too on the previous version of GHC. I'm on 
Intel Leopard.

How can I get cabal install readline to succeed on the new GHC?

Thanks much,

Martijn.