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Subject: Re: [Caml-list] Errors in installing 'lwt'

On 10/20/2014 04:59 PM, Helmut Brandl wrote:
> Hello,
> 
> I am trying to install 'js_of_ocaml' with 'opam' and run into some problems. It seems that the ocaml compile cannot compile the 'lwt' package.
> 
> $opam list
> Installed packages for system:
> base-unix           base  Unix library distributed with the OCaml compiler
> camlp4     4.02.0+system  Camlp4 is a system for writing extensible parsers for programming languages

Which Linux distribution are you using, and where did you get the packages from?
Do you have both the camlp4 executable and the camlp4 libraries installed (in case they are in separate packages)?


> # W: Failure("Command ''/home/helmut/.opam/system/bin/ocamlfind' query -format %d camlp4 > '/tmp/oasis-c39eab.txt'' terminated with error code 2")
> # ocamlfind: Package `camlp4' not found
> # W: Failure("Command ''/home/helmut/.opam/system/bin/ocamlfind' query -format %d camlp4 > '/tmp/oasis-5e24a6.txt'' terminated with error code 2")
> # ocamlfind: Package `camlp4.quotations.o' not found
> # W: Failure("Command ''/home/helmut/.opam/system/bin/ocamlfind' query -format %d camlp4.quotations.o > '/tmp/oasis-f94904.txt'' terminated with error code 2")
> # E: Cannot find buildable internal library 'lwt-preemptive' when checking build depends
> # E: Cannot find findlib package camlp4
> # E: Cannot find findlib package camlp4.extend
> # E: Cannot find findlib package camlp4.quotations.o

What is the output of:
ocamlfind list|grep camlp4

Did you install ocamlfind before or after you installed camlp4?

Best regards,
--Edwin