Download | Gtools Cabal
packages: . constraints: gtools >=0.1 Then run cabal build inside that project. If gtools is hosted on GitHub but not on Hackage, you can still use cabal to download and build it:
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: gtools cabal download
cabal install gtools-0.1.0.0 If you want to download and build gtools inside a project sandbox (to avoid dependency conflicts): packages:
Verify installation:
cabal install gtools --lib The --lib flag ensures the library is registered globally for GHC. Cause: Your GHC version is too old or
# 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:
:
packages: . constraints: gtools >=0.1 Then run cabal build inside that project. If gtools is hosted on GitHub but not on Hackage, you can still use cabal to download and build it:
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 install gtools-0.1.0.0 If you want to download and build gtools inside a project sandbox (to avoid dependency conflicts):
Verify installation:
cabal install gtools --lib The --lib flag ensures the library is registered globally for GHC.
# 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:
: