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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:
```
stack sdist
```

output:

Getting file list for C:\Qsync\SwEng\GitHub\JB\SandBox\Test6\random-1.2.1\
random> List of package sources written to file
random> 'C:\Users\Joerg\AppData\Local\Temp\stack-sdist-fede07f57c5e6536\source-files-list'
Building sdist tarball for C:\Qsync\SwEng\GitHub\JB\SandBox\Test6\random-1.2.1\
Wrote sdist tarball to C:\Qsync\SwEng\GitHub\JB\SandBox\Test6\random-1.2.1\.stack-work\dist\274b403a\random-1.2.1.tar.gz
Checking package 'random' for common mistakes
Package check reported the following warnings:
'ghc-options: -O2' is rarely needed. Check that it is giving a real benefit and not just imposing longer compile times on your users.

…
- command:
```
cd ..
```

to `stack.yaml` of main project add package (here `random-1.2.1`) to `extra-deps` section

extract

.
.
.
# extra-deps:
# - acme-missiles-0.3
# - git: https://github.com/commercialhaskell/stack.git
#   commit: e7b331f14bcffb8367cd58fbfc8b40ec7642100a
#
# extra-deps: []
extra-deps:
- random-1.2.1

# Override default flag values for local packages and extra-deps
# flags: {}
.
.
.

…
- command:
```
stack build
```

…
- command:
```
stack build
```

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