[Haskell-cafe] OpenSUSE 11.2

Daniel Fischer daniel.is.fischer at web.de
Sun Feb 28 12:55:39 EST 2010

Am Sonntag 28 Februar 2010 18:30:59 schrieb Andrew Coppin:
> Daniel Fischer wrote:
> > Am Sonntag 28 Februar 2010 17:52:19 schrieb Andrew Coppin:
> >> It also puts the binary in a strange place, but I guess I can live
> >> with that...
> >
> > Which strange place? By default, it should go to ~/.cabal/bin, I
> > think.
> Indeed. You'd expect it to be in some system-wide location, but
> apparently not.

Why? It could only be in a system-wide location if you installed as root. 
Not everybody who wants to install cabal is root/can sudo, so the natural 
default is ~/.cabal/bin or ~/bin. Since there are advantages to keep all 
cabal stuff in one place separate from whatever, ~/.cabal is preferable.

But if you want to have it system-wide (why would you, with a user cabal, 
you don't have to make a complete reinstall if you bork your installation), 
you can run

$ ./bootstrap.sh --global

> > Anyway, you should add that to your path, put something like
> >
> >
> > if [ -z `/bin/echo ${PATH} | /usr/bin/grep cabal` ]
> > then
> >     export PATH="/home/andrew/.cabal/bin:$PATH"
> > fi
> >
> > in your .bashrc
> Uh... what?

If the pattern "cabal" is not in your path, prepend ~/.cabal/bin to your 
path and export it. Then you can invoke executables in that directory 
without giving the path on the command line.

But yes, if you're new to shell-scripting, it all looks geek to you :)

> >> Now, hypothetically, I should have a Linux Haskell system, so I can
> >> actually compile *anything* that's on Hackage.
> >
> > Not really, you'll need to install external libraries (C stuff,
> > mostly) for many packages. But it should be a lot easier than on
> > Windows.
> On Linux, it seems you install the development package, rerun Cabal, and
> it it somehow "knows" that the library is installed and how to find in.

Mostly - there are a few standard locations for headers and libraries where 
configure looks, but stuff for some packages must be queried for by 
pkg-config, only some packages where that's necessary don't come with a .pc 
file, oops.

> On Windows... well, forget it. It'll never work, so you might as well
> not bother trying.

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