I need for example a minor version of a package, for example persistent-postgresql .. or hdbc-mysql or whatever.
If I run
cabal install persistent-postgresql
it will install persistent-postgresql version 1.3 and then I get the error 'At least the following dependencies are missing: persistent-postgresql >= 1.2 && < 1.3' That's why I would like to install an earlier version of this package to make it work. Or maybe there is another solution?
Thanks in advance.
Use npm list [package-name] to know the specific latest version of an installed package. Use npm install [package-name]@[version-number] to install an older version of a package. Prefix a version number with a caret (^) or a tilde (~) to specify to install the latest minor or patch version, respectively.
Using Cabal By default stack installs packages to ~/. cabal and ~/. ghc in your home directory.
Stack supports creating projects using templates. It also supports your own custom templates. Stack has built-in hpack support in it. It provides an alternative (IMO, a better) way of writing cabal files using yaml file which is more widely used in the industry.
You should probably try to cabal install the package that actually depends on persistent-postgresql
as cabal will then try to select the right version automatically.
However if you do need to do this, a simple way is:
cabal install persistent-postgresql-1.2.1.3
Or more complicated:
cabal install persistent-postgresql --constraint 'persistent-postgresql < 1.3'
Here you can just keep specifying that you want something earlier than a particular version as things don't work without needing to know the exact next version down. You can also place constraints on other packages if necessary.
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