diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..149df87
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,29 @@
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+name: Test
+
+jobs:
+  build:
+    runs-on: ${{ matrix.operating-system }}
+    strategy:
+      matrix:
+        include:
+          - operating-system: ubuntu-latest
+            php: 7.4
+            phpunit: 8
+          - operating-system: ubuntu-latest
+            php: 8.4
+            phpunit: 9
+    name: PHP ${{ matrix.php }}
+    steps:
+      - uses: actions/checkout@v3
+      - uses: php-actions/composer@v6
+      - uses: php-actions/phpunit@v3
+        with:
+          configuration: phpunit.xml.dist
+          version: ${{ matrix.phpunit }}
+          php_version:  ${{ matrix.php }}
diff --git a/.gitignore b/.gitignore
index 1a811a5..a8e26d7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 *~
 .idea/
+extern/
 vendor/
 bin/phpunit
 bin/civistrings.phar
diff --git a/README.md b/README.md
index a5d5485..f510cca 100644
--- a/README.md
+++ b/README.md
@@ -49,14 +49,24 @@ civistrings -o myfile.pot myfolder
 find -name '*.js' | civistrings - -o myfile.pot
 ```
 
-## Development and Testing
+## Development
 
-The "examples" folder includes a series of example input files and expected
-output files.  To see if the examples are correctly processed, simply run
-`phpunit`.
+For a full set of development and testing activities, you will need:
 
-If you need to add new examples or change the behavior of the test, update
-`tests/Command/ExtractCommandTest.php`.
+* [`git`](https://git-scm.com)
+* [`composer`](https://getcomposer.org/)
+* [`box`](http://box-project.github.io/box2/)
+* [`phpunit`](https://phpunit.de/)
+
+> __TIP__: If you use `nix-shell`, it will provide `php`, `git`, `composer`,
+> `box`, `phpunit8`, and `phpunit9`.
+
+### Testing
+
+Tests are based on a series of example files (e.g. `./examples/ex1.php` and
+the corresponding `./examples/ex1.pot`).
+
+To run the tests, simply call your favorite instance of `phpunit`.
 
 ### Build
 
diff --git a/composer.json b/composer.json
index 3ca1fd2..52d4384 100644
--- a/composer.json
+++ b/composer.json
@@ -26,8 +26,5 @@
             "php": "7.4.0"
         },
         "bin-dir": "bin"
-    },
-    "require-dev": {
-        "phpunit/phpunit": "9.6.*"
     }
 }
diff --git a/composer.lock b/composer.lock
index d0303a6..c090e17 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,20 +4,20 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "33fc85007eca9f4d87e4a4ca7505e3d8",
+    "content-hash": "5b0ebcba211e1caa6ddde751cdbf58bb",
     "packages": [
         {
             "name": "nikic/php-parser",
-            "version": "v4.19.4",
+            "version": "v4.19.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/nikic/PHP-Parser.git",
-                "reference": "715f4d25e225bc47b293a8b997fe6ce99bf987d2"
+                "reference": "51bd93cc741b7fc3d63d20b6bdcd99fdaa359837"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/715f4d25e225bc47b293a8b997fe6ce99bf987d2",
-                "reference": "715f4d25e225bc47b293a8b997fe6ce99bf987d2",
+                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/51bd93cc741b7fc3d63d20b6bdcd99fdaa359837",
+                "reference": "51bd93cc741b7fc3d63d20b6bdcd99fdaa359837",
                 "shasum": ""
             },
             "require": {
@@ -32,11 +32,6 @@
                 "bin/php-parse"
             ],
             "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "4.9-dev"
-                }
-            },
             "autoload": {
                 "psr-4": {
                     "PhpParser\\": "lib/PhpParser"
@@ -58,9 +53,9 @@
             ],
             "support": {
                 "issues": "https://github.com/nikic/PHP-Parser/issues",
-                "source": "https://github.com/nikic/PHP-Parser/tree/v4.19.4"
+                "source": "https://github.com/nikic/PHP-Parser/tree/v4.19.5"
             },
-            "time": "2024-09-29T15:01:53+00:00"
+            "time": "2025-12-06T11:45:25+00:00"
         },
         {
             "name": "psr/container",
@@ -945,1735 +940,7 @@
             "time": "2024-11-10T20:33:58+00:00"
         }
     ],
-    "packages-dev": [
-        {
-            "name": "doctrine/instantiator",
-            "version": "1.5.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/doctrine/instantiator.git",
-                "reference": "0a0fa9780f5d4e507415a065172d26a98d02047b"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/0a0fa9780f5d4e507415a065172d26a98d02047b",
-                "reference": "0a0fa9780f5d4e507415a065172d26a98d02047b",
-                "shasum": ""
-            },
-            "require": {
-                "php": "^7.1 || ^8.0"
-            },
-            "require-dev": {
-                "doctrine/coding-standard": "^9 || ^11",
-                "ext-pdo": "*",
-                "ext-phar": "*",
-                "phpbench/phpbench": "^0.16 || ^1",
-                "phpstan/phpstan": "^1.4",
-                "phpstan/phpstan-phpunit": "^1",
-                "phpunit/phpunit": "^7.5 || ^8.5 || ^9.5",
-                "vimeo/psalm": "^4.30 || ^5.4"
-            },
-            "type": "library",
-            "autoload": {
-                "psr-4": {
-                    "Doctrine\\Instantiator\\": "src/Doctrine/Instantiator/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Marco Pivetta",
-                    "email": "ocramius@gmail.com",
-                    "homepage": "https://ocramius.github.io/"
-                }
-            ],
-            "description": "A small, lightweight utility to instantiate objects in PHP without invoking their constructors",
-            "homepage": "https://www.doctrine-project.org/projects/instantiator.html",
-            "keywords": [
-                "constructor",
-                "instantiate"
-            ],
-            "support": {
-                "issues": "https://github.com/doctrine/instantiator/issues",
-                "source": "https://github.com/doctrine/instantiator/tree/1.5.0"
-            },
-            "funding": [
-                {
-                    "url": "https://www.doctrine-project.org/sponsorship.html",
-                    "type": "custom"
-                },
-                {
-                    "url": "https://www.patreon.com/phpdoctrine",
-                    "type": "patreon"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/doctrine%2Finstantiator",
-                    "type": "tidelift"
-                }
-            ],
-            "time": "2022-12-30T00:15:36+00:00"
-        },
-        {
-            "name": "myclabs/deep-copy",
-            "version": "1.13.4",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/myclabs/DeepCopy.git",
-                "reference": "07d290f0c47959fd5eed98c95ee5602db07e0b6a"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/07d290f0c47959fd5eed98c95ee5602db07e0b6a",
-                "reference": "07d290f0c47959fd5eed98c95ee5602db07e0b6a",
-                "shasum": ""
-            },
-            "require": {
-                "php": "^7.1 || ^8.0"
-            },
-            "conflict": {
-                "doctrine/collections": "<1.6.8",
-                "doctrine/common": "<2.13.3 || >=3 <3.2.2"
-            },
-            "require-dev": {
-                "doctrine/collections": "^1.6.8",
-                "doctrine/common": "^2.13.3 || ^3.2.2",
-                "phpspec/prophecy": "^1.10",
-                "phpunit/phpunit": "^7.5.20 || ^8.5.23 || ^9.5.13"
-            },
-            "type": "library",
-            "autoload": {
-                "files": [
-                    "src/DeepCopy/deep_copy.php"
-                ],
-                "psr-4": {
-                    "DeepCopy\\": "src/DeepCopy/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "description": "Create deep copies (clones) of your objects",
-            "keywords": [
-                "clone",
-                "copy",
-                "duplicate",
-                "object",
-                "object graph"
-            ],
-            "support": {
-                "issues": "https://github.com/myclabs/DeepCopy/issues",
-                "source": "https://github.com/myclabs/DeepCopy/tree/1.13.4"
-            },
-            "funding": [
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/myclabs/deep-copy",
-                    "type": "tidelift"
-                }
-            ],
-            "time": "2025-08-01T08:46:24+00:00"
-        },
-        {
-            "name": "phar-io/manifest",
-            "version": "2.0.4",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/phar-io/manifest.git",
-                "reference": "54750ef60c58e43759730615a392c31c80e23176"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/phar-io/manifest/zipball/54750ef60c58e43759730615a392c31c80e23176",
-                "reference": "54750ef60c58e43759730615a392c31c80e23176",
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-            },
-            "require": {
-                "ext-dom": "*",
-                "ext-libxml": "*",
-                "ext-phar": "*",
-                "ext-xmlwriter": "*",
-                "phar-io/version": "^3.0.1",
-                "php": "^7.2 || ^8.0"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "2.0.x-dev"
-                }
-            },
-            "autoload": {
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-            "authors": [
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-                    "name": "Arne Blankerts",
-                    "email": "arne@blankerts.de",
-                    "role": "Developer"
-                },
-                {
-                    "name": "Sebastian Heuer",
-                    "email": "sebastian@phpeople.de",
-                    "role": "Developer"
-                },
-                {
-                    "name": "Sebastian Bergmann",
-                    "email": "sebastian@phpunit.de",
-                    "role": "Developer"
-                }
-            ],
-            "description": "Component for reading phar.io manifest information from a PHP Archive (PHAR)",
-            "support": {
-                "issues": "https://github.com/phar-io/manifest/issues",
-                "source": "https://github.com/phar-io/manifest/tree/2.0.4"
-            },
-            "funding": [
-                {
-                    "url": "https://github.com/theseer",
-                    "type": "github"
-                }
-            ],
-            "time": "2024-03-03T12:33:53+00:00"
-        },
-        {
-            "name": "phar-io/version",
-            "version": "3.2.1",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/phar-io/version.git",
-                "reference": "4f7fd7836c6f332bb2933569e566a0d6c4cbed74"
-            },
-            "dist": {
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-                "shasum": ""
-            },
-            "require": {
-                "php": "^7.2 || ^8.0"
-            },
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-        },
-        {
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-            },
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-            "keywords": [
-                "filesystem",
-                "iterator"
-            ],
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-                "source": "https://github.com/sebastianbergmann/php-file-iterator/tree/3.0.6"
-            },
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-        },
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-            "version": "3.1.1",
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-                    "name": "Sebastian Bergmann",
-                    "email": "sebastian@phpunit.de"
-                },
-                {
-                    "name": "Jeff Welch",
-                    "email": "whatthejeff@gmail.com"
-                },
-                {
-                    "name": "Volker Dusch",
-                    "email": "github@wallbash.com"
-                },
-                {
-                    "name": "Adam Harvey",
-                    "email": "aharvey@php.net"
-                },
-                {
-                    "name": "Bernhard Schussek",
-                    "email": "bschussek@gmail.com"
-                }
-            ],
-            "description": "Provides the functionality to export PHP variables for visualization",
-            "homepage": "https://www.github.com/sebastianbergmann/exporter",
-            "keywords": [
-                "export",
-                "exporter"
-            ],
-            "support": {
-                "issues": "https://github.com/sebastianbergmann/exporter/issues",
-                "source": "https://github.com/sebastianbergmann/exporter/tree/4.0.6"
-            },
-            "funding": [
-                {
-                    "url": "https://github.com/sebastianbergmann",
-                    "type": "github"
-                }
-            ],
-            "time": "2024-03-02T06:33:00+00:00"
-        },
-        {
-            "name": "sebastian/global-state",
-            "version": "5.0.8",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/sebastianbergmann/global-state.git",
-                "reference": "b6781316bdcd28260904e7cc18ec983d0d2ef4f6"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/global-state/zipball/b6781316bdcd28260904e7cc18ec983d0d2ef4f6",
-                "reference": "b6781316bdcd28260904e7cc18ec983d0d2ef4f6",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=7.3",
-                "sebastian/object-reflector": "^2.0",
-                "sebastian/recursion-context": "^4.0"
-            },
-            "require-dev": {
-                "ext-dom": "*",
-                "phpunit/phpunit": "^9.3"
-            },
-            "suggest": {
-                "ext-uopz": "*"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "5.0-dev"
-                }
-            },
-            "autoload": {
-                "classmap": [
-                    "src/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Sebastian Bergmann",
-                    "email": "sebastian@phpunit.de"
-                }
-            ],
-            "description": "Snapshotting of global state",
-            "homepage": "http://www.github.com/sebastianbergmann/global-state",
-            "keywords": [
-                "global state"
-            ],
-            "support": {
-                "issues": "https://github.com/sebastianbergmann/global-state/issues",
-                "source": "https://github.com/sebastianbergmann/global-state/tree/5.0.8"
-            },
-            "funding": [
-                {
-                    "url": "https://github.com/sebastianbergmann",
-                    "type": "github"
-                },
-                {
-                    "url": "https://liberapay.com/sebastianbergmann",
-                    "type": "liberapay"
-                },
-                {
-                    "url": "https://thanks.dev/u/gh/sebastianbergmann",
-                    "type": "thanks_dev"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/sebastian/global-state",
-                    "type": "tidelift"
-                }
-            ],
-            "time": "2025-08-10T07:10:35+00:00"
-        },
-        {
-            "name": "sebastian/lines-of-code",
-            "version": "1.0.4",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/sebastianbergmann/lines-of-code.git",
-                "reference": "e1e4a170560925c26d424b6a03aed157e7dcc5c5"
-            },
-            "dist": {
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-                "url": "https://api.github.com/repos/sebastianbergmann/lines-of-code/zipball/e1e4a170560925c26d424b6a03aed157e7dcc5c5",
-                "reference": "e1e4a170560925c26d424b6a03aed157e7dcc5c5",
-                "shasum": ""
-            },
-            "require": {
-                "nikic/php-parser": "^4.18 || ^5.0",
-                "php": ">=7.3"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "^9.3"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.0-dev"
-                }
-            },
-            "autoload": {
-                "classmap": [
-                    "src/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Sebastian Bergmann",
-                    "email": "sebastian@phpunit.de",
-                    "role": "lead"
-                }
-            ],
-            "description": "Library for counting the lines of code in PHP source code",
-            "homepage": "https://github.com/sebastianbergmann/lines-of-code",
-            "support": {
-                "issues": "https://github.com/sebastianbergmann/lines-of-code/issues",
-                "source": "https://github.com/sebastianbergmann/lines-of-code/tree/1.0.4"
-            },
-            "funding": [
-                {
-                    "url": "https://github.com/sebastianbergmann",
-                    "type": "github"
-                }
-            ],
-            "time": "2023-12-22T06:20:34+00:00"
-        },
-        {
-            "name": "sebastian/object-enumerator",
-            "version": "4.0.4",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/sebastianbergmann/object-enumerator.git",
-                "reference": "5c9eeac41b290a3712d88851518825ad78f45c71"
-            },
-            "dist": {
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-                "url": "https://api.github.com/repos/sebastianbergmann/object-enumerator/zipball/5c9eeac41b290a3712d88851518825ad78f45c71",
-                "reference": "5c9eeac41b290a3712d88851518825ad78f45c71",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=7.3",
-                "sebastian/object-reflector": "^2.0",
-                "sebastian/recursion-context": "^4.0"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "^9.3"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "4.0-dev"
-                }
-            },
-            "autoload": {
-                "classmap": [
-                    "src/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Sebastian Bergmann",
-                    "email": "sebastian@phpunit.de"
-                }
-            ],
-            "description": "Traverses array structures and object graphs to enumerate all referenced objects",
-            "homepage": "https://github.com/sebastianbergmann/object-enumerator/",
-            "support": {
-                "issues": "https://github.com/sebastianbergmann/object-enumerator/issues",
-                "source": "https://github.com/sebastianbergmann/object-enumerator/tree/4.0.4"
-            },
-            "funding": [
-                {
-                    "url": "https://github.com/sebastianbergmann",
-                    "type": "github"
-                }
-            ],
-            "time": "2020-10-26T13:12:34+00:00"
-        },
-        {
-            "name": "sebastian/object-reflector",
-            "version": "2.0.4",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/sebastianbergmann/object-reflector.git",
-                "reference": "b4f479ebdbf63ac605d183ece17d8d7fe49c15c7"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/object-reflector/zipball/b4f479ebdbf63ac605d183ece17d8d7fe49c15c7",
-                "reference": "b4f479ebdbf63ac605d183ece17d8d7fe49c15c7",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=7.3"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "^9.3"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "2.0-dev"
-                }
-            },
-            "autoload": {
-                "classmap": [
-                    "src/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Sebastian Bergmann",
-                    "email": "sebastian@phpunit.de"
-                }
-            ],
-            "description": "Allows reflection of object attributes, including inherited and non-public ones",
-            "homepage": "https://github.com/sebastianbergmann/object-reflector/",
-            "support": {
-                "issues": "https://github.com/sebastianbergmann/object-reflector/issues",
-                "source": "https://github.com/sebastianbergmann/object-reflector/tree/2.0.4"
-            },
-            "funding": [
-                {
-                    "url": "https://github.com/sebastianbergmann",
-                    "type": "github"
-                }
-            ],
-            "time": "2020-10-26T13:14:26+00:00"
-        },
-        {
-            "name": "sebastian/recursion-context",
-            "version": "4.0.6",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/sebastianbergmann/recursion-context.git",
-                "reference": "539c6691e0623af6dc6f9c20384c120f963465a0"
-            },
-            "dist": {
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-                "url": "https://api.github.com/repos/sebastianbergmann/recursion-context/zipball/539c6691e0623af6dc6f9c20384c120f963465a0",
-                "reference": "539c6691e0623af6dc6f9c20384c120f963465a0",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=7.3"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "^9.3"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "4.0-dev"
-                }
-            },
-            "autoload": {
-                "classmap": [
-                    "src/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Sebastian Bergmann",
-                    "email": "sebastian@phpunit.de"
-                },
-                {
-                    "name": "Jeff Welch",
-                    "email": "whatthejeff@gmail.com"
-                },
-                {
-                    "name": "Adam Harvey",
-                    "email": "aharvey@php.net"
-                }
-            ],
-            "description": "Provides functionality to recursively process PHP variables",
-            "homepage": "https://github.com/sebastianbergmann/recursion-context",
-            "support": {
-                "issues": "https://github.com/sebastianbergmann/recursion-context/issues",
-                "source": "https://github.com/sebastianbergmann/recursion-context/tree/4.0.6"
-            },
-            "funding": [
-                {
-                    "url": "https://github.com/sebastianbergmann",
-                    "type": "github"
-                },
-                {
-                    "url": "https://liberapay.com/sebastianbergmann",
-                    "type": "liberapay"
-                },
-                {
-                    "url": "https://thanks.dev/u/gh/sebastianbergmann",
-                    "type": "thanks_dev"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/sebastian/recursion-context",
-                    "type": "tidelift"
-                }
-            ],
-            "time": "2025-08-10T06:57:39+00:00"
-        },
-        {
-            "name": "sebastian/resource-operations",
-            "version": "3.0.4",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/sebastianbergmann/resource-operations.git",
-                "reference": "05d5692a7993ecccd56a03e40cd7e5b09b1d404e"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/resource-operations/zipball/05d5692a7993ecccd56a03e40cd7e5b09b1d404e",
-                "reference": "05d5692a7993ecccd56a03e40cd7e5b09b1d404e",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=7.3"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "^9.0"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-main": "3.0-dev"
-                }
-            },
-            "autoload": {
-                "classmap": [
-                    "src/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Sebastian Bergmann",
-                    "email": "sebastian@phpunit.de"
-                }
-            ],
-            "description": "Provides a list of PHP built-in functions that operate on resources",
-            "homepage": "https://www.github.com/sebastianbergmann/resource-operations",
-            "support": {
-                "source": "https://github.com/sebastianbergmann/resource-operations/tree/3.0.4"
-            },
-            "funding": [
-                {
-                    "url": "https://github.com/sebastianbergmann",
-                    "type": "github"
-                }
-            ],
-            "time": "2024-03-14T16:00:52+00:00"
-        },
-        {
-            "name": "sebastian/type",
-            "version": "3.2.1",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/sebastianbergmann/type.git",
-                "reference": "75e2c2a32f5e0b3aef905b9ed0b179b953b3d7c7"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/type/zipball/75e2c2a32f5e0b3aef905b9ed0b179b953b3d7c7",
-                "reference": "75e2c2a32f5e0b3aef905b9ed0b179b953b3d7c7",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=7.3"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "^9.5"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "3.2-dev"
-                }
-            },
-            "autoload": {
-                "classmap": [
-                    "src/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Sebastian Bergmann",
-                    "email": "sebastian@phpunit.de",
-                    "role": "lead"
-                }
-            ],
-            "description": "Collection of value objects that represent the types of the PHP type system",
-            "homepage": "https://github.com/sebastianbergmann/type",
-            "support": {
-                "issues": "https://github.com/sebastianbergmann/type/issues",
-                "source": "https://github.com/sebastianbergmann/type/tree/3.2.1"
-            },
-            "funding": [
-                {
-                    "url": "https://github.com/sebastianbergmann",
-                    "type": "github"
-                }
-            ],
-            "time": "2023-02-03T06:13:03+00:00"
-        },
-        {
-            "name": "sebastian/version",
-            "version": "3.0.2",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/sebastianbergmann/version.git",
-                "reference": "c6c1022351a901512170118436c764e473f6de8c"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/version/zipball/c6c1022351a901512170118436c764e473f6de8c",
-                "reference": "c6c1022351a901512170118436c764e473f6de8c",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=7.3"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "3.0-dev"
-                }
-            },
-            "autoload": {
-                "classmap": [
-                    "src/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Sebastian Bergmann",
-                    "email": "sebastian@phpunit.de",
-                    "role": "lead"
-                }
-            ],
-            "description": "Library that helps with managing the version number of Git-hosted PHP projects",
-            "homepage": "https://github.com/sebastianbergmann/version",
-            "support": {
-                "issues": "https://github.com/sebastianbergmann/version/issues",
-                "source": "https://github.com/sebastianbergmann/version/tree/3.0.2"
-            },
-            "funding": [
-                {
-                    "url": "https://github.com/sebastianbergmann",
-                    "type": "github"
-                }
-            ],
-            "time": "2020-09-28T06:39:44+00:00"
-        },
-        {
-            "name": "theseer/tokenizer",
-            "version": "1.2.3",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/theseer/tokenizer.git",
-                "reference": "737eda637ed5e28c3413cb1ebe8bb52cbf1ca7a2"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/737eda637ed5e28c3413cb1ebe8bb52cbf1ca7a2",
-                "reference": "737eda637ed5e28c3413cb1ebe8bb52cbf1ca7a2",
-                "shasum": ""
-            },
-            "require": {
-                "ext-dom": "*",
-                "ext-tokenizer": "*",
-                "ext-xmlwriter": "*",
-                "php": "^7.2 || ^8.0"
-            },
-            "type": "library",
-            "autoload": {
-                "classmap": [
-                    "src/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Arne Blankerts",
-                    "email": "arne@blankerts.de",
-                    "role": "Developer"
-                }
-            ],
-            "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
-            "support": {
-                "issues": "https://github.com/theseer/tokenizer/issues",
-                "source": "https://github.com/theseer/tokenizer/tree/1.2.3"
-            },
-            "funding": [
-                {
-                    "url": "https://github.com/theseer",
-                    "type": "github"
-                }
-            ],
-            "time": "2024-03-03T12:36:25+00:00"
-        }
-    ],
+    "packages-dev": [],
     "aliases": [],
     "minimum-stability": "stable",
     "stability-flags": {},
diff --git a/nix/buildkit-update.sh b/nix/buildkit-update.sh
new file mode 100755
index 0000000..6b5a43c
--- /dev/null
+++ b/nix/buildkit-update.sh
@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+{ # https://stackoverflow.com/a/21100710
+
+  ## Re-generate the buildkit.nix file - with the current 'master' branch.
+
+  set -e
+
+  if [ ! -f "nix/buildkit.nix" ]; then
+    echo >&2 "Must run in project root"
+    exit 1
+  fi
+
+  now=$( date -u '+%Y-%m-%d %H:%M %Z' )
+  commit=$( git ls-remote https://github.com/civicrm/civicrm-buildkit.git | awk '/refs\/heads\/master$/ { print $1 }' )
+  url="https://github.com/civicrm/civicrm-buildkit/archive/${commit}.tar.gz"
+  hash=$( nix-prefetch-url "$url" --type sha256 --unpack )
+
+  function render_file() {
+    echo "{ pkgs ? import <nixpkgs> {} }:"
+    echo ""
+    echo "## Get civicrm-buildkit from github."
+    echo "## Based on \"master\" branch circa $now"
+    echo "import (pkgs.fetchzip {"
+    echo "  url = \"$url\";"
+    echo "  sha256 = \"$hash\";"
+    echo "})"
+    echo
+    echo "## Get a local copy of civicrm-buildkit. (Useful for developing patches.)"
+    echo "# import ((builtins.getEnv \"HOME\") + \"/buildkit/default.nix\")"
+    echo "# import ((builtins.getEnv \"HOME\") + \"/bknix/default.nix\")"
+  }
+  render_file > nix/buildkit.nix
+
+  exit
+}
diff --git a/nix/buildkit.nix b/nix/buildkit.nix
new file mode 100644
index 0000000..35a6c31
--- /dev/null
+++ b/nix/buildkit.nix
@@ -0,0 +1,12 @@
+{ pkgs ? import <nixpkgs> {} }:
+
+## Get civicrm-buildkit from github.
+## Based on "master" branch circa 2025-12-17 04:09 UTC
+import (pkgs.fetchzip {
+  url = "https://github.com/civicrm/civicrm-buildkit/archive/e9aa5e95195ac82d6058c6929887ea91917f14e3.tar.gz";
+  sha256 = "1difffv64aam9jkcn62iqg2v6wccr23r29c624s7l045maby5ak9";
+})
+
+## Get a local copy of civicrm-buildkit. (Useful for developing patches.)
+# import ((builtins.getEnv "HOME") + "/buildkit/default.nix")
+# import ((builtins.getEnv "HOME") + "/bknix/default.nix")
diff --git a/scripts/build.sh b/scripts/build.sh
new file mode 100755
index 0000000..601c674
--- /dev/null
+++ b/scripts/build.sh
@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+
+## This script generates git-scan.phar.
+## NOTE: as written, it will *not* work within nix-shell, but it will work on non-nix environments.
+
+## Determine the absolute path of the directory with the file
+## usage: absdirname <file-path>
+function absdirname() {
+  pushd $(dirname $0) >> /dev/null
+    pwd
+  popd >> /dev/null
+}
+
+SCRDIR=$(absdirname "$0")
+PRJDIR=$(dirname "$SCRDIR")
+export PATH="$PRJDIR/extern:$PATH"
+
+set -ex
+composer install --prefer-dist --no-progress --no-suggest --no-dev
+which box
+php -d phar.read_only=0 `which box` compile -v
diff --git a/shell.nix b/shell.nix
new file mode 100644
index 0000000..7adb211
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1,33 @@
+/**
+ * This shell is suitable for compiling PHAR executables.... and not much else.
+ *
+ * Ex: `nix-shell --run ./scripts/build.sh`
+ */
+
+{ pkgs ? import <nixpkgs> {} }:
+
+let
+
+  buildkit = (import ./nix/buildkit.nix) { inherit pkgs; };
+
+in
+
+  pkgs.mkShell {
+    nativeBuildInputs = buildkit.profiles.base ++ [
+
+      (buildkit.pins.v2505.php82.buildEnv {
+        extraConfig = ''
+          memory_limit=-1
+        '';
+      })
+
+      buildkit.pkgs.box
+      buildkit.pkgs.composer
+      buildkit.pkgs.phpunit9
+
+      pkgs.bash-completion
+    ];
+    shellHook = ''
+      source ${pkgs.bash-completion}/etc/profile.d/bash_completion.sh
+    '';
+  }