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How to install openssl35-dev in Ubuntu 26.04 (resolute)

Development files for openssl35

Vendor: GetPageSpeed LLC https://github.com/openssl/openssl

Install

curl -fsSL https://extras.getpagespeed.com/release-latest.deb -o /tmp/getpagespeed-release.deb
sudo apt-get install -y /tmp/getpagespeed-release.deb
rm /tmp/getpagespeed-release.deb
sudo apt-get update
sudo apt-get install -y openssl35-dev

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Description

An ABI-isolated build of the OpenSSL 3.5 LTS line carrying the Encrypted Client Hello (ECH, RFC 9849) backport from the DEfO project. This package provides the C headers (under /usr/include/openssl35/openssl/), the development .so symlinks, and pkg-config files (libcrypto+openssl35.pc, libssl+openssl35.pc, openssl+openssl35.pc) for building applications against openssl35.

Packages

Package Size Built
openssl35-dev_3.5.8-1~gps1+ubuntu2604+stable_amd64 278 KiB 2026-10-17
openssl35-dev_3.5.8-1~gps1+ubuntu2604+stable_arm64 278 KiB 2026-10-17

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