Re: [MirageOS-devel] Error installing mirage ERROR while installing lwt.2.4.8

[Anil Madhavapeddy <anil@xxxxxxxxxx>]

Hi Andrew,

It looks like you were missing a system camlp4 installation in your earlier 
build failure.  If you have a system OCaml compiler installed, you also need to 
have a corresponding camlp4-extra package installed.  There are two 
alternatives:

- Use the Ubuntu PPA with the latest stable OPAM. See 
http://opam.ocaml.org/doc/Install.html#Ubuntu

- The latest Ubuntu Vivid has OPAM 1.2 already, so you can just do `apt-get 
install opam` and then build a custom compiler switch via "opam switch 4.02.1". 
 This will also build camlp4 inside the switch as a package dependency.

Both of these should avoid the need to clone OPAM from its git head, which is 
the development version and may come with its own issues.

Anil

> On 28 May 2015, at 06:59, Andrew Stuart <andrew.stuart@xxxxxxxxxxxxxxxxxx> 
> wrote:
> 
> For anyone trying to install to Ubuntu, this is the incantation that worked 
> for me from a clean Ubuntu install:
> 
> sudo apt-get update
> sudo apt-get -y install build-essential m4 ocaml ocaml-native-compilers 
> camlp4-extra git build-essential unzip camlp4-extra libev-dev
> git clone https://github.com/ocaml/opam.git
> cd opam
> ./configure
> make lib-ext
> make
> sudo make install
> opam init
> eval `opam config env`
> opam install mirage
> 
> 
> 
> Iâm not sure why I have had so much trouble with this in the past. It seems 
> that maybe doing things in the wrong order can lead to dependencies 
> mismatching or something.  Anyway the above works for me.
> 
> as
> 
> 
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