# Install libevent with Homebrew, apk, apt, dnf, MacPorts, Nix, pacman, zypper Asynchronous event library. Version 2.1.13 via Homebrew; verified 2026-07-01. ## Install ```sh sudo av install brew:libevent ``` Additional install commands: ### macOS - Homebrew (100%): ```sh brew install libevent ``` Evidence: local Homebrew formula metadata - MacPorts (94%): ```sh sudo port install libevent ``` Evidence: MacPorts ports tree: devel/libevent/Portfile from https://api.github.com/repos/macports/macports-ports/git/trees/master?recursive=1 ### Linux - apk (92%): ```sh sudo apk add libevent ``` Evidence: Alpine Linux edge package indexes: libevent from https://dl-cdn.alpinelinux.org/alpine/edge/main/x86_64/APKINDEX.tar.gz - Debian apt (92%): ```sh sudo apt install libevent-2.1-7t64 ``` Evidence: Debian stable package indexes: libevent-2.1-7t64 from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz - dnf (92%): ```sh sudo dnf install libevent ``` Evidence: Fedora Rawhide package metadata: libevent 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#libevent ``` Evidence: nixpkgs package indexes: pkgs/by-name/li/libevent/package.nix from https://api.github.com/repos/NixOS/nixpkgs/git/trees/master?recursive=1 - pacman (92%): ```sh sudo pacman -S libevent ``` Evidence: Arch Linux sync databases: libevent from https://geo.mirror.pkgbuild.com/core/os/x86_64/core.db.tar.gz - zypper (92%): ```sh sudo zypper install libevent-2_1-7 ``` Evidence: openSUSE Tumbleweed package metadata: libevent-2_1-7 from https://download.opensuse.org/tumbleweed/repo/oss/repodata/be8d3611d25469107f32075a1697e69ec57a2b850b42348a658cc671ad5ec2b50760d02c3e59524d50da9a11d5be799bdaffba2e166e8ca8858512e3c0bd665d-primary.xml.zst ## Package facts - **Package key:** brew:libevent - **Package manager:** Homebrew - **Package manager page:** - **Version:** 2.1.13 - **Source summary:** Asynchronous event library - **Homepage:** - **Repository:** - **Upstream docs:** - **License:** BSD-3-Clause - **Source archive:** - **Last updated:** 2026-07-01T17:46:43Z - **Generated:** 2026-07-08T07:18:31+00:00 ## Executables - event_rpcgen.py (cli) - event_rpcgen.py (alias) ## Dependencies - openssl@3 ## Build dependencies - autoconf - automake - libtool - 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: 2.1.13 - Package-manager updated: 2026-07-01 - Local data: ok - Upstream repository: https://github.com/libevent/libevent - info: No cached GitHub release or tag data was available. ## Project history and usage libevent is a portable C event-notification library for scalable network servers and event-driven programs. ### Project history The libevent site describes the library as a replacement for hand-written event loops in network servers: programs register callbacks for file-descriptor readiness, timers, signals, and higher-level buffered I/O rather than hard-coding select or poll loops. The site credits maintenance to Nick Mathewson, Azat Khuzhin, and Niels Provos. The project grew around the C10K-era problem of serving many simultaneous connections portably across backends such as select, poll, epoll, kqueue, /dev/poll, Solaris event ports, and Windows APIs. Over time it added buffered network I/O, DNS, HTTP, RPC, SSL-capable bufferevents, thread hooks, and extensive portability code. ### Adoption history The official site lists widely used downstreams including Chromium, memcached, Transmission, NTP's SNTP code, tmux, Tor, Prosody, PgBouncer, and coturn. That breadth made libevent one of the standard C event-loop dependencies in Unix package collections. ### How it is used Typical applications create an event_base, register events or bufferevents, and run event_base_dispatch. The official documentation covers setup, event bases, timers, buffered I/O, asynchronous DNS, embedded HTTP servers, and RPC support. ### Why package nerds care libevent is package-nerd-famous because it abstracts the messy portability matrix behind scalable C networking. It is old enough to show up in classic daemons and new enough to have ABI/API reports, split libraries, CMake and autotools history, and long-lived 1.4, 2.0, and 2.1 release lines. ### Timeline - 2009: Niels Provos announced libevent 1.4.12-stable and libevent 2.0.2-alpha on July 29, 2009. - 2010: The libevent site lists libevent-1.4.14b-stable released June 7, 2010. - 2012: The libevent site lists the first 2.1.x alpha release on April 3, 2012 and libevent-2.0.21-stable released November 18, 2012. - 2014: The libevent site lists libevent-2.0.22-stable released January 5, 2014. - 2017: The libevent site lists libevent-2.1.8-stable released January 22, 2017. - 2020: The libevent site lists libevent-2.1.12-stable released July 5, 2020. - 2023: The libevent site lists libevent-2.2.1-alpha-dev released May 21, 2023. ### Related projects - Related event-loop and networking projects include libev, libuv, Boost.Asio, and downstream users such as Tor, memcached, tmux, Transmission, Chromium, PgBouncer, and coturn. ### Sources - - - - - ## Security Notes library-like package without higher-risk signals. - **Geiger risk:** green / low - library-like package without higher-risk signals ## Source Database Details - **Source Database:** Homebrew formula API - **Tap:** homebrew/core - **Full Name:** libevent - **Version Scheme:** 0 - **Revision:** 0 - **Bottle Stable Root URL:** - **Deprecated:** no - **Disabled:** no - **Keg Only:** no - **URL Keys:** stable ## Other Package-Manager Records - Debian apt - libevent-2.1-7t64 - 2.1.12-stable-10+b1: normalized package name match | Debian stable package indexes: libevent-2.1-7t64 from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz | Asynchronous event notification library | https://libevent.org/ - Debian apt - libevent-core-2.1-7t64 - 2.1.12-stable-10+b1: normalized package name match | Debian stable package indexes: libevent-core-2.1-7t64 from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz | Asynchronous event notification library (core) | https://libevent.org/ - Debian apt - libevent-dev - 2.1.12-stable-10+b1: normalized package name match | Debian stable package indexes: libevent-dev from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz | Asynchronous event notification library (development files) | https://libevent.org/ - Debian apt - libevent-extra-2.1-7t64 - 2.1.12-stable-10+b1: normalized package name match | Debian stable package indexes: libevent-extra-2.1-7t64 from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz | Asynchronous event notification library (extra) | https://libevent.org/ - Debian apt - libevent-openssl-2.1-7t64 - 2.1.12-stable-10+b1: normalized package name match | Debian stable package indexes: libevent-openssl-2.1-7t64 from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz | Asynchronous event notification library (openssl) | https://libevent.org/ - Debian apt - libevent-pthreads-2.1-7t64 - 2.1.12-stable-10+b1: normalized package name match | Debian stable package indexes: libevent-pthreads-2.1-7t64 from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz | Asynchronous event notification library (pthreads) | https://libevent.org/ - Nix - libevent: normalized package name match | nixpkgs package indexes: pkgs/by-name/li/libevent/package.nix from https://api.github.com/repos/NixOS/nixpkgs/git/trees/master?recursive=1 - Ubuntu apt - libevent-2.1-7t64 - 2.1.12-stable-9ubuntu2: normalized package name match | Ubuntu 24.04 LTS package indexes: libevent-2.1-7t64 from https://archive.ubuntu.com/ubuntu/dists/noble/main/binary-amd64/Packages.gz | Asynchronous event notification library | https://libevent.org/ - Ubuntu apt - libevent-core-2.1-7t64 - 2.1.12-stable-9ubuntu2: normalized package name match | Ubuntu 24.04 LTS package indexes: libevent-core-2.1-7t64 from https://archive.ubuntu.com/ubuntu/dists/noble/main/binary-amd64/Packages.gz | Asynchronous event notification library (core) | https://libevent.org/ - Ubuntu apt - libevent-dev - 2.1.12-stable-9ubuntu2: normalized package name match | Ubuntu 24.04 LTS package indexes: libevent-dev from https://archive.ubuntu.com/ubuntu/dists/noble/main/binary-amd64/Packages.gz | Asynchronous event notification library (development files) | https://libevent.org/ - Ubuntu apt - libevent-extra-2.1-7t64 - 2.1.12-stable-9ubuntu2: normalized package name match | Ubuntu 24.04 LTS package indexes: libevent-extra-2.1-7t64 from https://archive.ubuntu.com/ubuntu/dists/noble/main/binary-amd64/Packages.gz | Asynchronous event notification library (extra) | https://libevent.org/ - Ubuntu apt - libevent-openssl-2.1-7t64 - 2.1.12-stable-9ubuntu2: normalized package name match | Ubuntu 24.04 LTS package indexes: libevent-openssl-2.1-7t64 from https://archive.ubuntu.com/ubuntu/dists/noble/main/binary-amd64/Packages.gz | Asynchronous event notification library (openssl) | https://libevent.org/ - Ubuntu apt - libevent-pthreads-2.1-7t64 - 2.1.12-stable-9ubuntu2: normalized package name match | Ubuntu 24.04 LTS package indexes: libevent-pthreads-2.1-7t64 from https://archive.ubuntu.com/ubuntu/dists/noble/main/binary-amd64/Packages.gz | Asynchronous event notification library (pthreads) | https://libevent.org/ - apk - libevent - 2.1.12-r9: normalized package name match | Alpine Linux edge package indexes: libevent from https://dl-cdn.alpinelinux.org/alpine/edge/main/x86_64/APKINDEX.tar.gz | An event notification library | https://libevent.org/ - apk - libevent-dev - 2.1.12-r9: normalized package name match | Alpine Linux edge package indexes: libevent-dev from https://dl-cdn.alpinelinux.org/alpine/edge/main/x86_64/APKINDEX.tar.gz | An event notification library (development files) | https://libevent.org/ - apk - libevent-static - 2.1.12-r9: normalized package name match | Alpine Linux edge package indexes: libevent-static from https://dl-cdn.alpinelinux.org/alpine/edge/main/x86_64/APKINDEX.tar.gz | An event notification library (static libraries) | https://libevent.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. - [openssl@3](https://www.automicvault.com/pkg/brew/openssl-3/) - Runtime dependency declared by Homebrew. - [autoconf](https://www.automicvault.com/pkg/brew/autoconf/) - Build dependency declared by Homebrew. - [automake](https://www.automicvault.com/pkg/brew/automake/) - Build dependency declared by Homebrew. - [libtool](https://www.automicvault.com/pkg/brew/libtool/) - Build dependency declared by Homebrew. - [pkgconf](https://www.automicvault.com/pkg/brew/pkgconf/) - Build dependency declared by Homebrew. - [amber](https://www.automicvault.com/pkg/brew/amber/) - Popular package that depends on this formula. - [bitcoin](https://www.automicvault.com/pkg/brew/bitcoin/) - Popular package that depends on this formula. - [coturn](https://www.automicvault.com/pkg/brew/coturn/) - Popular package that depends on this formula. - [crystal-icr](https://www.automicvault.com/pkg/brew/crystal-icr/) - 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Shares av.db curated category or tags: c-library, cli, developer-tools, libraries. - [libxslt](https://www.automicvault.com/pkg/brew/libxslt/) - Shares av.db curated category or tags: c-library, cli, developer-tools, libraries. - [ncurses](https://www.automicvault.com/pkg/brew/ncurses/) - Shares av.db curated category or tags: c-library, cli, developer-tools, libraries. - [onigmo](https://www.automicvault.com/pkg/brew/onigmo/) - Shares av.db curated category or tags: c-library, cli, developer-tools, libraries. - [poco](https://www.automicvault.com/pkg/brew/poco/) - Local metadata places this package in an adjacent workflow. Shared terms: cli, developer, developer-tools, libraries, network. - [activemq-cpp](https://www.automicvault.com/pkg/brew/activemq-cpp/) - Local package facts share a topical domain. Shared terms: cli, developer, developer-tools, libraries, openssl. ## Combined YAML source View the package source record on GitHub. [combined/libevent.yml](https://github.com/automic-vault/db/blob/main/combined/libevent.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