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Author: Admin | 2025-04-28
(but use the right version number for Hydra):cd Hydra-i.j.kcabal install --libIn a directory where you are running circuits, create a file named .ghci containing the following lines::set -package mtl:set -package parsec:set -package filepath:set -package containersVerify that Hydra is workingThe following commands should simulate a 4-bit word adder for several clock cycles, with different inputs during each cycle.$ cd examples/adder$ ghc -e main Add4RunIn case of difficultySee the user guides for ghc and cabal for more information. The ghc-pkg list command shows the installed packages.Hidden packageIf you get a message saying that there are “hidden packages”, copy the following into a file named .ghci in your circuit directory::set -package mtl:set -package parsec:set -package filepath:set -package containersMissing libraryOn some versions of Linux, the cabal install –lib command may fail with an error message like this:/usr/bin/ld.gold: error: cannot find -lgmpcollect2: error: ld returned 1 exit status`gcc' failed in phase `Linker'. (Exit code: 1)Error: cabal: Failed to build hydra-3.5.7.This means the linker was unable to find a library, which you can install:sudo apt-get install libgmp3-devConflict with previous installationSometimes an installation may fail if there was a previous installation. If this happens, find the ghc environment default file, which is located at a path similar to the following (with your username and the right version numbers):Linux:~/.ghc/x86_64-linux-9.4.8/environments/default Windows:C:/Users/username/AppData/Roaming/ghc/x86_64-mingw32-9.2.3/environments/defaultOpen this file in a text editor and find the line containing an entry for hydra, which should look something like this:package-id hydra-3.4.5-VeryLongHashKeyDelete the lines for hydra, save the default file, and try the cabal install --lib command again.Alternative:
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