Cabal Download | Gtools

cabal v2-install --lib git+https://github.com/username/gtools.git Once cabal install gtools --lib succeeds, you can use it in a .hs file:

Verify installation:

git clone https://github.com/username/gtools.git cd gtools cabal build cabal install --lib Or, in one line: gtools cabal download

:

cabal list --installed cabal list gtools # searches Hackage If nothing appears, the package may be from a different ecosystem or a private repository. Cause: Your GHC version is too old or too new for the gtools version you’re trying to install. Fix: Use cabal install gtools --allow-older or switch GHC versions via ghcup . Error 3: "Cabal: Failed to build gtools: Missing foreign library" Some gtools versions depend on C libraries (e.g., gsl , blas ). Install them system-wide: cabal v2-install --lib git+https://github

Compile and run:

# Ubuntu/Debian sudo apt install libgsl-dev libblas-dev brew install gsl Error 4: "cabal: Could not resolve dependencies" This is a version conflict. Use a fresh cabal project with a cabal.project file: Error 3: "Cabal: Failed to build gtools: Missing

If the gtools you need is not on Hackage, it might be a private or legacy package. In that case, you’ll need to use cabal in a different way (e.g., pointing to a Git repo). The gtools cabal download command is not a standalone command. Instead, you use cabal to download, build, and install the package. Here’s what you need first: 1. Install GHC (Glasgow Haskell Compiler) # On Ubuntu/Debian sudo apt install ghc On macOS (using Homebrew) brew install ghc On Windows (using Chocolatey) choco install ghc 2. Install Cabal (the build tool) # Using your distro's package manager (often outdated) sudo apt install cabal-install Recommended: Use ghcup (Haskell toolchain manager) curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | sh ghcup install cabal latest