[Haskell-beginners] cabal install readline: Missing HSReadlline.h on Mac OS X Leopard

[man]

I got this error installing readline (I really was installing lambdabot, it
depends on readline):

Configuring readline-1.0.1.0...
checking for gcc... gcc
checking for C compiler default output file name... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables...
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking for GNUreadline.framework... checking for readline... yes
checking for rl_readline_version... yes
checking for rl_begin_undo_group... yes
checking for rl_erase_empty_line... yes
checking for rl_free_undo_list... yes
checking for rl_completion_word_break_hook in -lreadline... yes
configure: creating ./config.status
config.status: creating config.mk
config.status: creating readline.buildinfo
config.status: creating include/HsReadlineConfig.h
cabal: Missing dependency on a foreign library:
* Missing header file: HsReadline.h
This problem can usually be solved by installing the system package that
provides this library (you may need the "-dev" version). If the library is
already installed but in a non-standard location then you can use the flags
--extra-include-dirs= and --extra-lib-dirs= to specify where it is.
cabal: Error: some packages failed to install:
lambdabot-4.2.2.1 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


This is on Leopard, with GNUreadline installed. As far as I see, HSReadline
is an internally generated header in readline-1.0.1.0, how possibly cabal
may be missing it? I got nothing with google, only that readline seems to be
problematic on OSX.

PS: I just installed cabal-install in ~/.cabal, it installs other packages
without fuss (gsl-random being an exception, but it may be the GSL part...).

Any help welcome!

-- 
happy hacking... man
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