# Install logtalk with Homebrew

Declarative object-oriented logic programming language. Version 3.101.0 via Homebrew; verified 2026-07-23.

## Install

```sh
sudo av install brew:logtalk
```

Additional install commands:

### macOS

- Homebrew (100%):

```sh
brew install logtalk
```

  Evidence: provider-native install command

## Package facts

- **Package key:** brew:logtalk
- **Package manager:** Homebrew
- **Version:** 3.101.0
- **Source summary:** Declarative object-oriented logic programming language
- **Homepage:** <https://logtalk.org/>
- **Repository:** <https://github.com/LogtalkDotOrg/logtalk3>
- **Last updated:** 2026-07-23T17:20:34Z
- **Generated:** 2026-08-03T00:40:33+00:00

## Executables

- bplgt (alias)
- ciaolgt (alias)
- cxlgt (alias)
- eclipselgt (alias)
- gplgt (alias)
- jiplgt (alias)
- lgt2html (alias)
- lgt2md (alias)
- lgt2pdf (alias)
- lgt2rst (alias)
- lgt2svg (alias)
- lgt2txt (alias)
- lgt2xml (alias)
- lgtenv (alias)
- logtalk_allure_report (alias)
- logtalk_backend_select (alias)
- logtalk_doclet (alias)
- logtalk_setup_env.sh (alias)
- logtalk_tester (alias)
- logtalk_user_setup (alias)
- logtalk_version_select (alias)
- quintuslgt (alias)
- sicstuslgt (alias)
- swilgt (alias)
- taulgt (alias)
- tplgt (alias)
- xsblgt (alias)
- xvmlgt (alias)
- yaplgt (alias)

## Install behavior

- Bottle: not available

## Freshness

- Page generated: 2026-08-03
- Package-manager version: 3.101.0
## Project history and usage

Logtalk is a declarative object-oriented logic programming language that extends Prolog with encapsulation, code reuse, protocols, categories, events, and tooling for programming in the large.

### Project history

The Logtalk project began in January 1998. Official Logtalk materials state that the first public alpha appeared in July 1998, the first public beta in October 1998, and the first stable 2.0 release in February 1999.

Logtalk's third generation started in 2012, with the first public alpha in August 2012 and the stable 3.0.0 release in January 2015. The official GitHub repository for `logtalk3` was created in August 2012, matching that third-generation development line.

The upstream README describes Logtalk as a portable trans-compiler that can use most modern standards-compliant Prolog systems as backend compilers. Its distribution includes documentation, tutorials, libraries, developer tools, examples, man pages, and release notes.

### Adoption history

Logtalk is specialized rather than mainstream, but it has had unusually long continuity for a language package. The official site provides installers and documentation, and the supplied package facts list availability through Homebrew, MacPorts, and Windows Package Manager.

Its adoption is tied to the Prolog ecosystem: Logtalk offers a common object-oriented and component-oriented layer above multiple backend Prolog compilers, so package managers tend to expose many integration scripts such as `swilgt`, `gplgt`, `sicstuslgt`, and others.

### How it is used

Users run Logtalk through backend-specific integration scripts and load `.lgt` source files. The manual documents `settings.lgt` files for customizing compiler flags and library paths, searched from startup, user, home, and platform config directories.

The package also ships documentation conversion and testing tools such as `lgt2html`, `lgt2md`, `lgt2pdf`, and `logtalk_tester`, making it both a language runtime and a developer-tool suite.

### Why package nerds care

Logtalk matters in package history because it is a rare long-running logic-language layer whose package surface is mostly integration scripts. Maintaining it is less about one binary and more about connecting a portable language implementation to many Prolog backends and documentation tools.

### Timeline

- 1998: Project started in January; first public alpha released in July.
- 1999: First stable 2.0 release published in February.
- 2012: Third-generation development starts and the `logtalk3` repository is created.
- 2015: Logtalk 3.0.0 stable release published.
- 2026: Logtalk 3.100.x tags appear in the official repository.

### Related projects

- Logtalk is designed to run on top of backend Prolog systems, including SWI-Prolog, GNU Prolog, SICStus Prolog, XSB, YAP, and others documented by its integration scripts.
- It is related to Prolog module systems, object-oriented Prolog extensions, and multi-paradigm logic programming environments.

### Sources

- <https://api.github.com/repos/LogtalkDotOrg/logtalk3>
- <https://github.com/LogtalkDotOrg/logtalk3#readme>
- <https://logtalk.org/documentation.html>
- <https://logtalk.org/handbook/index.html>
- <https://logtalk.org/manuals/userman/programming.html>
- source_facts.package-manager


## Security Notes

generalized runtime or code generation signal.

- **Geiger risk:** yellow / medium
- generalized runtime or code generation signal


## Configuration and credential file locations

These source-backed paths show where this package keeps local settings or durable credentials. Automic Vault can use them as review targets for secret scanning, migration, and command approval.


## Configuration files

- Unix: $LOGTALK_STARTUP_DIRECTORY/settings.lgt, $LOGTALKUSER/settings.lgt, ~/settings.lgt, $XDG_CONFIG_HOME/logtalk/settings.lgt, ~/.config/logtalk/settings.lgt
- Windows: %USERPROFILE%\settings.lgt, %APPDATA%\Logtalk\settings.lgt

## Combined YAML source

View the package source record on GitHub. [combined/logtalk.yml](https://github.com/automic-vault/db/blob/main/combined/logtalk.yml)


## Sources

- Nucleus package database
- Geiger risk classifier
- curated configuration and credential file locations
- curated package history
- pkgdb category and tag curation