I have rarely encountered problems when creating or installing
packages using Cabal. In fact, the opposite is the case: I find it
annoying when installing packages that haven't been cabalized because
they don't pull in all of their dependencies automatically.
It looks like there was a problem building readline, perhaps because
it had trouble finding libreadline on your system. If this is the
case, then the problem has nothing to do with Cabal but merely with
the fact that a single dependent package failed to install. Have you
tried building readline by itself and seeing the error message that it
gives?
Cheers,
Greg
On Nov 8, 2009, at 7:29 PM, Philippos Apolinarius wrote:
I made small improvements in the Small Japi Binding, and asked how
to make it available. I received a few private messages advising me
to build and package the library using a tool called cabal. Since I
have used installation tools for PLT, R and LaTeX libraries, I
thought cabal was something similar. However, I noticed that there
are a lot of complaints against cabal. Therefore, I decided to
install cabal, and try it. It seems that it is easier to install
packages by hand than using cabal. Here is a typical cabal session:
D:\ghc\ghcapi>cabal update
Downloading the latest package list from hackage.haskell.org
D:\ghc\ghcapi>cabal install mkcabal
Resolving dependencies...
Downloading pcre-light-0.3.1...
Configuring pcre-light-0.3.1...
Downloading readline-1.0.1.0...
Configuring readline-1.0.1.0...
cabal: Error: some packages failed to install:
mkcabal-0.4.2 depends on readline-1.0.1.0 which failed to install.
pcre-light-0.3.1 failed during the configure step. The exception was:
exit: ExitFailure 1
readline-1.0.1.0 failed during the configure step. The exception was:
exit: ExitFailure 1
As one can see, it is much more difficult to use than R installation
tools, or MikTeX installation tools. If cabal is so difficult, why
use it? I am sure that I have done something very stupid mistake,
but believe me, a lot of people is trying to use cabal and failing.
I am not sure that it is a good idea to distribute libraries using
cabal. However, this is irrelevant, because I am sure that creating
a package with cabal is well beyond my powers. It is much easier to
write a complete JAPI library, than packaging it in cabal.
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