Try doing cabal update and then compiling On Mon, Oct 11, 2021 at 5:12 PM David Duke wrote:

Thanks Dominic George for that. I had env var set. iconv --version gives GNU libiconv 1.16 I created a clean shell so env vars set other than PATH and installed using the tarball on the link George provided. It appeared to install okay . However trying to compile throws up:

cannot satisfy -package-id ghc-9.0.1 compiling with -v:

Loaded package environment from /Users/scsdjd/.ghc/x86_64-darwin-9.0.1/environments/default

Glasgow Haskell Compiler, Version 9.0.1, stage 2 booted by GHC version 8.8.4

*** initializing unit database:

There is no package.cache in /usr/local/lib/ghc-9.0.1/package.conf.d, checking if the database is empty

There are no .conf files in /usr/local/lib/ghc-9.0.1/package.conf.d, treating package database as empty

Using binary package database: /Users/scsdjd/.cabal/store/ghc-9.0.1/package.db/package.cache

package flags [-package-id ghc-9.0.1{unit ghc-9.0.1 True ([])},

regards, David

On Mon, Oct 11, 2021 at 3:52 PM George Colpitts wrote:

...

Hi David

I've also used ghc for years on Mac OS and have also never seen this problem. I don't use nix. Currently I am on ghc 9.0.1. and Mac OS 11.6. I installed from

https://downloads.haskell.org/ghc/9.0.1/

More specifically ghc-9.0.1-x86_64-apple-darwin.tar.xz https://downloads.haskell.org/ghc/9.0.1/ghc-9.0.1-x86_64-apple-darwin.tar.xz

Are any of the following env variables defined on your system?

LD_LIBRARY_PATH, DYLD_LIBRARY_PATH, and DYLD_FALLBACK_LIBRARY_PATH

None are defined on my system which I think is normal.

When you type

iconv --version

What output do you get? I get

iconv --version iconv (GNU libiconv 1.11) Copyright (C) 2000-2006 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Written by Bruno Haible.

Not sure if my questions will help but I think there is something unusual about your system configuration.

Cheers George

On Mon, Oct 11, 2021 at 9:38 AM Dominic Steinitz wrote:

...

Hi David

I am a long time user of ghc on OSX. I have seen that problem but never on native OSX only when using nix (and then I added it explicitly).

Two things spring to mind:

1. Add it explicitly on the compile command `-liconv` 2. Use nix and then you can control the build environment in a totally controllable and reproducible manner. This is actually easier than it sounds: `curl https://nixos.org/nix/install | sh` and `nix-env -I ghc`. If you get the same error with that then we can try adding `iconv` explicitly.

Dominic Steinitz dominic@steinitz.org http://idontgetoutmuch.org Twitter: @idontgetoutmuch

I have a conundrum on which advice would be appreciate. Does anyone know how to successfully install ghc on OSX I've tried various binary instalation routes: macports, brew, direct binary downloads from haskel.org All have the same result. when I try to compile a basic hello world program I get

Undefined symbols for architecture x86_64: "_iconv", referenced from:

I've triedgiong through ghcup

8.8.4 8.6.5. 8.10.2 8.10.7 9.0.1

all have the same problem. I'd be happy to build from source. Small problem: what Haskell compiler do I use?

Any advice on installs that works along with any changes to paths to avoid the iconv problems would be appreciated as currently my Haskell-related activities have come to a grinding halt. Switchig to a different OS would be nice but its not a feasible option a at present.Writing a compiler is starting to look attractive..

thanks David

-- David Duke Emeritus Professor of Computer Science School of Computing University of Leeds UK E:duke.j.david@gmail.com W:https://engineering.leeds.ac.uk/staff/334/Professor_David_Duke

_______________________________________________ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/glasgow-haskell-users

_______________________________________________ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/glasgow-haskell-users

-- David Duke Emeritus Professor of Computer Science School of Computing University of Leeds UK E:duke.j.david@gmail.com W:https://engineering.leeds.ac.uk/staff/334/Professor_David_Duke