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docs: note multiple versions of same package issue

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Simon Michael 2010-09-05 23:24:09 +00:00
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MANUAL.markdown
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@ -1025,6 +1025,21 @@ sailing. Here are some known issues and things to try:
Look for the cause of the failure near the end of the output. If it's Look for the cause of the failure near the end of the output. If it's
not apparent, try again with `-v2` or `-v3` for more verbose output. not apparent, try again with `-v2` or `-v3` for more verbose output.
- **This package indirectly depends on multiple versions of the same package.**
You may have previously installed some of hledger's dependencies
depending on different versions of (eg) parsec. Then cabal install hledger gives
an error like this:
Warning: This package indirectly depends on multiple versions of the same
package. This is highly likely to cause a compile failure.
package yesod-0.5.0.3 requires parsec-2.1.0.1
package csv-0.1.1 requires parsec-3.1.0
...
The above example could be resolved by, eg:
$ cabal install yesod --reinstall --constraint 'parsec == 3.1.0"
- **cabal fails to resolve dependencies.** - **cabal fails to resolve dependencies.**
It's possible for cabal to get confused, eg if you have It's possible for cabal to get confused, eg if you have
installed/updated many cabal package versions or GHC itself. You can installed/updated many cabal package versions or GHC itself. You can