openssl version # Output example: OpenSSL 3.0.2 15 Mar 2022 (Library: OpenSSL 3.0.2 15 Mar 2022) RHEL 9 and Fedora use OpenSSL 3.0. RHEL 8 and CentOS 8 use OpenSSL 1.1.1.
./Configure --prefix=/opt/openssl-3.3.0 --openssldir=/opt/openssl-3.3.0/ssl shared linux-x86_64 (Replace linux-x86_64 with your platform: darwin64-arm64-cc for Apple Silicon, mingw64 for Windows cross-compile) # Build (use -jN for parallel jobs, e.g., -j4 for 4 cores) make -j$(nproc) Run the test suite (highly recommended before installing) make test how to install openssl
./config
export CFLAGS="-I/opt/openssl-3.3.0/include" export LDFLAGS="-L/opt/openssl-3.3.0/lib" export PKG_CONFIG_PATH="/opt/openssl-3.3.0/lib/pkgconfig" ./configure --with-ssl=/opt/openssl-3.3.0 Cause: The linker cannot find libssl. Ensure you have the development package installed ( libssl-dev on Debian, openssl-devel on RHEL). Problem 4: OpenSSL command found, but openssl version shows old version Cause: A different openssl binary appears earlier in your PATH. openssl version # Output example: OpenSSL 3