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[docs] Added a note about SWIFT_EXEC in the README #200

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Mar 15, 2016
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[docs] Added a note about SWIFT_EXEC in the README #200

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9 changes: 9 additions & 0 deletions README.md
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Expand Up @@ -90,6 +90,15 @@ following options:
* [llbuild](https://github.com/apple/swift-llbuild) cloned parallel to your SwiftPM clone
* Possibly, [a more recent Swift snapshot](https://swift.org/download)

###Choosing Swift version

The `SWIFT_EXEC` environment variable specifies the `swiftc` executable path used by `swift build`. If it is not set, SPM will try to locate it:

1. In `swift-build`'s parent directory.
2. (on OS X) by calling `xcrun --find swiftc`
3. in PATH


There is further development-oriented documentation in [Documentation/Internals](Documentation/Internals).


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