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* Fix patchBuildToolProgs when haddock cannot be foundJavier Neira2020-02-101-7/+12
| | | | Cabal's GHC.configure doesn't demand haddock exist, so we have to handle the case where it's not installed.
* Add support for symlink farming as a workaround for StackDaniel Gröber2019-09-291-0/+99
We want to be able to have the build tool use exactly the compiler and related executables we choose. Stack doesn't really like that mode of operation and insists on getting everything from PATH itself so this commit adds support for creating a temporary symlink farm to convince Stack to use the executables we want it to use.