# Install fltk with Homebrew, apk, dnf, MacPorts, Nix, pacman, zypper, apt Cross-platform C++ GUI toolkit. Version 1.4.5 via Homebrew; verified 2026-04-26. ## Install ```sh sudo av install brew:fltk ``` Additional install commands: ### macOS - Homebrew (100%): ```sh brew install fltk ``` Evidence: local Homebrew formula metadata - MacPorts (94%): ```sh sudo port install fltk ``` Evidence: MacPorts ports tree: aqua/fltk/Portfile from https://api.github.com/repos/macports/macports-ports/git/trees/master?recursive=1 ### Linux - apk (92%): ```sh sudo apk add fltk ``` Evidence: Alpine Linux edge package indexes: fltk from https://dl-cdn.alpinelinux.org/alpine/edge/community/x86_64/APKINDEX.tar.gz - dnf (92%): ```sh sudo dnf install fltk ``` Evidence: Fedora Rawhide package metadata: fltk from https://dl.fedoraproject.org/pub/fedora/linux/development/rawhide/Everything/x86_64/os/repodata/e5ca8ce900cd68f5419e1c39ae517343100b306336cbaeb70a3c153121d95094-primary.xml.zst - Nix (92%): ```sh nix profile install nixpkgs#fltk ``` Evidence: nixpkgs package indexes: fltk from https://raw.githubusercontent.com/NixOS/nixpkgs/master/pkgs/top-level/all-packages.nix - pacman (92%): ```sh sudo pacman -S fltk ``` Evidence: Arch Linux sync databases: fltk from https://geo.mirror.pkgbuild.com/extra/os/x86_64/extra.db.tar.gz - zypper (92%): ```sh sudo zypper install fltk-devel ``` Evidence: openSUSE Tumbleweed package metadata: fltk-devel from https://download.opensuse.org/tumbleweed/repo/oss/repodata/be8d3611d25469107f32075a1697e69ec57a2b850b42348a658cc671ad5ec2b50760d02c3e59524d50da9a11d5be799bdaffba2e166e8ca8858512e3c0bd665d-primary.xml.zst - Debian apt (92%): ```sh sudo apt install fltk-options ``` Evidence: Debian stable package indexes: fltk-options from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz - Ubuntu apt (92%): ```sh sudo apt install fluid ``` Evidence: Ubuntu 24.04 LTS package indexes: fluid from https://archive.ubuntu.com/ubuntu/dists/noble/universe/binary-amd64/Packages.gz ## Package facts - **Package key:** brew:fltk - **Package manager:** Homebrew - **Package manager page:** - **Version:** 1.4.5 - **Source summary:** Cross-platform C++ GUI toolkit - **Homepage:** - **Repository:** - **Upstream docs:** - **License:** LGPL-2.0-only WITH FLTK-exception - **Source archive:** - **Last updated:** 2026-04-26T11:48:19Z - **Generated:** 2026-07-08T07:18:31+00:00 ## Executables - fltk-config (cli) - fltk-options (cli) - fluid (cli) - fltk-config (alias) - fltk-options (alias) - fluid (alias) ## Dependencies - jpeg-turbo - libpng ## Build dependencies - pkgconf ## Install behavior - Post-install hook: not defined - Bottle: available on arm64_linux, arm64_sequoia, arm64_sonoma, arm64_tahoe, sonoma, x86_64_linux ## Freshness - Page generated: 2026-07-08 - Package-manager version: 1.4.5 - Package-manager updated: 2026-04-26 - Local data: ok - Upstream repository: https://github.com/fltk/fltk - info: No cached GitHub release or tag data was available. ## Project history and usage FLTK, the Fast Light Tool Kit, is a lightweight cross-platform C++ GUI toolkit for Unix/Linux, Windows, and macOS, with OpenGL support and the FLUID interface designer. ### Project history Official FLTK sources say the toolkit was originally developed by Bill Spitzak and is now maintained by a small worldwide group of developers. Its README describes it as a compact C++ GUI toolkit for Unix/Linux, Windows, and macOS that avoids bloat while supporting modern GUI functionality and OpenGL. FLTK's public history reaches back to the late 1990s. The official README lists copyright from 1998 onward, and the 1.0 change log records the 1.0 series through 1.0.11 in May 2001. Later release branches continued through the long-lived 1.1, 1.3, and 1.4 series. ### Adoption history FLTK has been adopted by developers who need a small native GUI toolkit with permissive LGPL-with-exception licensing and broad platform reach. The project does not provide binary distributions, instead pointing users to source releases and operating-system package managers. The toolkit has stayed relevant in package collections because it builds small GUI utilities and ships useful developer commands such as fltk-config and FLUID, while avoiding heavier desktop-framework dependencies. ### How it is used Developers use FLTK as a C++ library for native GUI applications and use FLUID to design interfaces and generate code. The fltk-config tool reports compile and link flags for downstream builds. Modern FLTK builds use CMake, with source releases and generated documentation published by the project. FLTK 1.5 development removes autotools support and requires a C++11-capable compiler. ### Why package nerds care FLTK is package-nerd significant because it is a tiny but long-lived GUI toolkit with stable command-line helpers, cross-platform backends, bundled image-library considerations, OpenGL integration, and many downstream packages that depend on its headers and config script. It also illustrates a common packaging transition: older autotools workflows coexisting with, and later yielding to, CMake-only builds. ### Timeline - 1998: Official README copyright range begins for FLTK. - 2001: FLTK 1.0.11 closes the early 1.0 change-log range. - 2024: FLTK 1.4.0 is released. - 2025: FLTK 1.4.2 is released with bug fixes, platform fixes, Wayland improvements, FLUID improvements, and documentation updates. - 2026: FLTK 1.4.5 is released; 1.5 development prepares a CMake-only, C++11-required branch. ### Related projects - Official FLTK sources connect the package to FLUID, OpenGL and GLUT emulation, CMake, Doxygen-generated documentation, and platform backends for X11, Wayland, Windows, and macOS. ### Sources - - - - - - - - - ## Security Notes narrow executable package without higher-risk signals. - **Geiger risk:** green / low - narrow executable package without higher-risk signals ## Source Database Details - **Source Database:** Homebrew formula API - **Tap:** homebrew/core - **Full Name:** fltk - **Aliases:** fltk@1.4 - **Version Scheme:** 0 - **Revision:** 0 - **Head Version:** HEAD - **Bottle Stable Root URL:** - **Deprecated:** no - **Disabled:** no - **Keg Only:** no - **URL Keys:** head, stable ## Other Package-Manager Records - Nix - fltk: normalized package name match | nixpkgs package indexes: fltk from https://raw.githubusercontent.com/NixOS/nixpkgs/master/pkgs/top-level/all-packages.nix - apk - fltk - 1.3.11-r1: normalized package name match | Alpine Linux edge package indexes: fltk from https://dl-cdn.alpinelinux.org/alpine/edge/community/x86_64/APKINDEX.tar.gz | A cross-platform C++ GUI toolkit | https://www.fltk.org/ - apk - fltk-dev - 1.3.11-r1: normalized package name match | Alpine Linux edge package indexes: fltk-dev from https://dl-cdn.alpinelinux.org/alpine/edge/community/x86_64/APKINDEX.tar.gz | A cross-platform C++ GUI toolkit (development files) | https://www.fltk.org/ - apk - fltk-doc - 1.3.11-r1: normalized package name match | Alpine Linux edge package indexes: fltk-doc from https://dl-cdn.alpinelinux.org/alpine/edge/community/x86_64/APKINDEX.tar.gz | A cross-platform C++ GUI toolkit (documentation) | https://www.fltk.org/ - apk - fltk-fluid - 1.3.11-r1: normalized package name match | Alpine Linux edge package indexes: fltk-fluid from https://dl-cdn.alpinelinux.org/alpine/edge/community/x86_64/APKINDEX.tar.gz | Fast Light User Interface Designer | https://www.fltk.org/ - apk - libfltk - 1.3.11-r1: normalized package name match | Alpine Linux edge package indexes: libfltk from https://dl-cdn.alpinelinux.org/alpine/edge/community/x86_64/APKINDEX.tar.gz | A cross-platform C++ GUI toolkit | https://www.fltk.org/ - apk - libfltk_cairo - 1.3.11-r1: normalized package name match | Alpine Linux edge package indexes: libfltk_cairo from https://dl-cdn.alpinelinux.org/alpine/edge/community/x86_64/APKINDEX.tar.gz | A cross-platform C++ GUI toolkit | https://www.fltk.org/ - apk - libfltk_forms - 1.3.11-r1: normalized package name match | Alpine Linux edge package indexes: libfltk_forms from https://dl-cdn.alpinelinux.org/alpine/edge/community/x86_64/APKINDEX.tar.gz | A cross-platform C++ GUI toolkit | https://www.fltk.org/ - apk - libfltk_gl - 1.3.11-r1: normalized package name match | Alpine Linux edge package indexes: libfltk_gl from https://dl-cdn.alpinelinux.org/alpine/edge/community/x86_64/APKINDEX.tar.gz | A cross-platform C++ GUI toolkit | https://www.fltk.org/ - apk - libfltk_images - 1.3.11-r1: normalized package name match | Alpine Linux edge package indexes: libfltk_images from https://dl-cdn.alpinelinux.org/alpine/edge/community/x86_64/APKINDEX.tar.gz | A cross-platform C++ GUI toolkit | https://www.fltk.org/ - dnf - fltk - 1.4.5-1.fc45: normalized package name match | Fedora Rawhide package metadata: fltk from https://dl.fedoraproject.org/pub/fedora/linux/development/rawhide/Everything/x86_64/os/repodata/e5ca8ce900cd68f5419e1c39ae517343100b306336cbaeb70a3c153121d95094-primary.xml.zst | C++ user interface toolkit | http://www.fltk.org/ - dnf - fltk-devel - 1.4.5-1.fc45: normalized package name match | Fedora Rawhide package metadata: fltk-devel from https://dl.fedoraproject.org/pub/fedora/linux/development/rawhide/Everything/x86_64/os/repodata/e5ca8ce900cd68f5419e1c39ae517343100b306336cbaeb70a3c153121d95094-primary.xml.zst | Development files for fltk | http://www.fltk.org/ - dnf - fltk-fluid - 1.4.5-1.fc45: normalized package name match | Fedora Rawhide package metadata: fltk-fluid from https://dl.fedoraproject.org/pub/fedora/linux/development/rawhide/Everything/x86_64/os/repodata/e5ca8ce900cd68f5419e1c39ae517343100b306336cbaeb70a3c153121d95094-primary.xml.zst | Fast Light User Interface Designer | http://www.fltk.org/ - dnf - fltk-options - 1.4.5-1.fc45: normalized package name match | Fedora Rawhide package metadata: fltk-options from https://dl.fedoraproject.org/pub/fedora/linux/development/rawhide/Everything/x86_64/os/repodata/e5ca8ce900cd68f5419e1c39ae517343100b306336cbaeb70a3c153121d95094-primary.xml.zst | Fast Light Tool Kit Options Editor | http://www.fltk.org/ - dnf - fltk-static - 1.4.5-1.fc45: normalized package name match | Fedora Rawhide package metadata: fltk-static from https://dl.fedoraproject.org/pub/fedora/linux/development/rawhide/Everything/x86_64/os/repodata/e5ca8ce900cd68f5419e1c39ae517343100b306336cbaeb70a3c153121d95094-primary.xml.zst | Static libraries for fltk | http://www.fltk.org/ - dnf - mingw32-fltk - 1.4.5-1.fc45: normalized package name match | Fedora Rawhide package metadata: mingw32-fltk from https://dl.fedoraproject.org/pub/fedora/linux/development/rawhide/Everything/x86_64/os/repodata/e5ca8ce900cd68f5419e1c39ae517343100b306336cbaeb70a3c153121d95094-primary.xml.zst | MinGW compiled fltk for the Win32 target | http://www.fltk.org/ ## Related links - [Terminal utility packages](https://www.automicvault.com/pkg/terminal-utilities/) - Matched terminal and command-line workflow metadata. - [Text processing packages](https://www.automicvault.com/pkg/text-processing-tools/) - Matched text, document, or structured-data processing metadata. - [Developer build packages](https://www.automicvault.com/pkg/developer-build-tools/) - Matched build, compiler, generator, or developer workflow metadata. - [Networking and protocol packages](https://www.automicvault.com/pkg/networking-protocol-tools/) - Matched network, protocol, or remote-service metadata. - [jpeg-turbo](https://www.automicvault.com/pkg/brew/jpeg-turbo/) - Runtime dependency declared by Homebrew. - [libpng](https://www.automicvault.com/pkg/brew/libpng/) - Runtime dependency declared by Homebrew. - [pkgconf](https://www.automicvault.com/pkg/brew/pkgconf/) - Build dependency declared by Homebrew. - [csound](https://www.automicvault.com/pkg/brew/csound/) - Popular package that depends on this formula. - [gmsh](https://www.automicvault.com/pkg/brew/gmsh/) - Popular package that depends on this formula. - [limesuite](https://www.automicvault.com/pkg/brew/limesuite/) - Popular package that depends on this formula. - [nestopia-ue](https://www.automicvault.com/pkg/brew/nestopia-ue/) - Popular package that depends on this formula. - [octave](https://www.automicvault.com/pkg/brew/octave/) - Popular package that depends on this formula. - [fox](https://www.automicvault.com/pkg/brew/fox/) - Shares av.db curated category or tags: c-plus-plus, cli, cross-platform, developer-tools, gui. - [qt](https://www.automicvault.com/pkg/brew/qt/) - Shares av.db curated category or tags: c-plus-plus, cli, cross-platform, developer-tools, gui. - [gecode](https://www.automicvault.com/pkg/brew/gecode/) - Shares av.db curated category or tags: c-plus-plus, cli, developer-tools, toolkit. - [gtk+](https://www.automicvault.com/pkg/brew/gtk/) - Shares av.db curated category or tags: cli, developer-tools, gui, toolkit. - [gtk+3](https://www.automicvault.com/pkg/brew/gtk-3/) - Shares av.db curated category or tags: cli, developer-tools, gui, toolkit. - [poco](https://www.automicvault.com/pkg/brew/poco/) - Shares av.db curated category or tags: c-plus-plus, cli, cross-platform, developer-tools. - [vte3](https://www.automicvault.com/pkg/brew/vte3/) - Shares av.db curated category or tags: cli, developer-tools, gui-toolkit. - [webkitgtk](https://www.automicvault.com/pkg/brew/webkitgtk/) - Shares av.db curated category or tags: cli, developer-tools, gui-toolkit. - [wxwidgets](https://www.automicvault.com/pkg/brew/wxwidgets/) - Local package facts share a topical domain. Shared terms: c-plus-plus, cli, config, cross, cross-platform. ## Combined YAML source View the package source record on GitHub. [combined/fltk.yml](https://github.com/automic-vault/db/blob/main/combined/fltk.yml) ## Sources - Nucleus package database - Geiger risk classifier - package-page enrichment - curated package history - package version freshness - av.db category and tag curation - package relationship graph - external package-manager database matches - cross-ecosystem install command graph