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Building a package locally from source using "stack"

in the project folder type:

command:
```
stack unpack random-1.2.1
```

output:

Unpacked random (from Hackage) to C:\Qsync\SwEng\GitHub\JB\SandBox\Test6\random-1.2.1\

…
- command:
```
cd random-1.2.1
```

…

command:
```
stack init
```

output:

Looking for .cabal or package.yaml files to use to init the project.
Using cabal packages:
- .\

Selecting the best among 20 snapshots...

* Matches https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/18/25.yaml

Selected resolver: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/18/25.yaml
Initialising configuration using resolver: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/18/25.yaml
Total number of user packages considered: 1
Writing configuration to file: stack.yaml
All done.

…
- command:
```
cd ..
```

…
- command:
```
stack build
```

…
- command:
```
stack build
```

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