[Haskell-beginners] error with cabal install readline

[Ashish Agarwal]

I'm on a Mac, and trying to install readline through cabal. I installed the
readline library through macports and thus tried the command below. However,
readline is still not found. Are there other options I can try? Thank you.

$ cabal install readline --extra-include-dirs=/opt/local/include/
--extra-lib-dirs=/opt/local/lib/
Resolving dependencies...
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... no
checking for tputs in -lncurses... yes
checking for readline in -lreadline... yes
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:
readline-1.0.1.0 failed during the configure step. The exception was:
exit: ExitFailure 1
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