cabal-install

I currently have a Yesod web application that I am developing on NixOS. I am using a default.nix file like described in O'Charles' blog post : { haskellPackages ? (import <nixpkgs> {}).haskellPackages }: haskellPackages.cabal.mkDerivation (self: { pname = "myblog"; version = "0.0.0"; src = ./.; isLibrary = true; isExecutable = true; buildDepends = with haskellPackages; [ aeson bson conduit dataDefault fastLogger hjsmin httpConduit monadControl monadLogger mongoDB persistent #persistentMongoDB persistentTemplate poolConduit shakespeare text waiExtra waiLogger warp yaml yesod yesodAuth yesodCore

I am trying to cabal install yesod on my Windows machine. I have a relatively fresh install of the Haskell Platform. The cabal install failed, reporting that I need the sqlite3 C library in order to install "persistent", a package which Yesod relies upon. cabal: Missing dependency on a foreign library: * Missing C library: sqlite3 So I went to http://www.sqlite.org/download.html and grabbed both the C source and the precompiled binary. I tried using both, to no avail: cabal install persistent --extra-lib-dirs=C:\Path\To\C\Source\Files cabal install persistent --extra-lib-dirs=C:\Path\To\Binary

This is a well-known bug that cabal can not handle proxies in format http://user:password@host:port format. On Haskell mailing list, someone suggested a patch to overcome this but that patch is now quite old. It fails with following message Downloading the latest package list from hackage.haskell.org Warning: invalid http proxy uri: "http://user:pass@host:80/" Warning: proxy uri must be http with a hostname Warning: ignoring http proxy, trying a direct connection Does anyone know how to make cabal use my proxy settings? Any indirect method will also do such as proxy bypassing etc. A similar

I am trying to get the Hat debugger. When I try: cabal install hat OR cabal install hat -v At the end I get: configure: error: in `/tmp/terminfo-0.4.0.0-17745/terminfo-0.4.0.0': configure: error: curses headers could not be found, so this package cannot be built See `config.log' for more details Failed to install terminfo-0.4.0.0 cabal: Error: some packages failed to install: haskeline-0.7.1.3 depends on terminfo-0.4.0.0 which failed to install. hat-2.8.0.0 depends on terminfo-0.4.0.0 which failed to install. terminfo-0.4.0.0 failed during the configure step. The exception was: ExitFailure 1

I've implemented a custom preprocessor which creates *.hs files form *.tpl files. It is specified in Setup.hs by using a Build-Type: Custom . Everything works fine, but I can't create tar.gz package from it (using cabal sdist ). Cabal complains, that it can not find the exposed modules which are generated by the preprocessor. The error message is cabal: Error: Could not find module with any suffix: ["gc","chs","hsc","x","y","ly","cpphs","hs","lhs"] How can I make Cabal aware of the fact that the module is not missing, or maybe add tpl to the known file extensions, or something? This is a known

When I install Haskell/GHC+cabal via sudo apt-get I installed cabal version 1.16. This is obviously not the most up to date version. How would I go about upgrade to at least version 1.18? I tried doing sudo apt-get update and sudo apt-get upgrade . Edit: Also when I run cabal install cabal-install it appears to "install" version 1.20 but when I run cabal -V it says cabal 1.16.0 Fixed it by adding the following line to my ~/.profile : export PATH=$(HOME)/.cabal/bin:$PATH 来源： https://stackoverflow.com/questions/25902613/upgrade-cabal-on-ubuntu-14-04