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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 section `extra-deps`

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: {}
.
.
.

to `package.yaml` of main project add dependency to package (here `random`) with constraint (here ` == 1.2.1`) to section `dependencies`

extract

.
.
.
# common to point users to the README.md file.
description:         Please see the README on GitHub at <https://github.com/githubuser/Test6#readme>

dependencies:
- base >= 4.7 && < 5
- random == 1.2.1

library:
  source-dirs: src
.
.
.

delete cabal-file (here `Test6.cabal`)

…

command:
```
stack build
```

output:

splitmix> using precompiled package
random  > configure
random  > Configuring random-1.2.1...
random  > build
random  > Preprocessing library for random-1.2.1..
random  > Building library for random-1.2.1..
random  > [1 of 4] Compiling System.Random.GFinite
random  > [2 of 4] Compiling System.Random.Internal
random  > [3 of 4] Compiling System.Random
random  > [4 of 4] Compiling System.Random.Stateful
random  > copy/register
random  > Installing library in C:\sr\snapshots\467f001a\lib\x86_64-windows-ghc-8.10.7\random-1.2.1-HT6KBuAXK636deJWA2IfmN
random  > Registering library for random-1.2.1..
Test6   > configure (lib + exe)
Configuring Test6-0.1.0.0...
Test6   > build (lib + exe)
Preprocessing library for Test6-0.1.0.0..
Building library for Test6-0.1.0.0..
[1 of 2] Compiling Lib
[2 of 2] Compiling Paths_Test6
Preprocessing executable 'Test6-exe' for Test6-0.1.0.0..
Building executable 'Test6-exe' for Test6-0.1.0.0..
[1 of 2] Compiling Main [Lib changed]
[2 of 2] Compiling Paths_Test6
Linking .stack-work\dist\274b403a\build\Test6-exe\Test6-exe.exe ...
Test6   > copy/register
Installing library in C:\Qsync\SwEng\GitHub\JB\SandBox\Test6\.stack-work\install\af603770\lib\x86_64-windows-ghc-8.10.7\Test6-0.1.0.0-37H5nARYQZNVVlIIsBxXW
Installing executable Test6-exe in C:\Qsync\SwEng\GitHub\JB\SandBox\Test6\.stack-work\install\af603770\bin
Registering library for Test6-0.1.0.0..
Completed 3 action(s).

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