Build OpenSSL 1.1.1w from source on Debian 11 (x86_64),

To build OpenSSL 1.1.1w from source on Debian 11 (x86_64), follow these steps:

1. Install Dependencies

Before compiling OpenSSL, ensure you have the necessary build tools and dependencies installed:

sudo apt update
sudo apt install -y build-essential checkinstall perl zlib1g-dev

2. Download and Extract OpenSSL Source

wget https://github.com/openssl/openssl/releases/download/OpenSSL_1_1_1w/openssl-1.1.1w.tar.gz
tar -xvzf openssl-1.1.1w.tar.gz
cd openssl-1.1.1w

3. Configure OpenSSL

Configure OpenSSL with a suitable prefix (e.g., /usr/local/ssl) and enable optimizations:

./config --prefix=/usr/local/ssl --openssldir=/usr/local/ssl shared zlib

If you need static libraries instead, remove shared.

4. Compile and Install

make -j$(nproc)  # Compiles using all available CPU cores
sudo make install

5. Update Library Paths

Ensure your system uses the newly compiled OpenSSL instead of the default Debian version.

5.1 Add OpenSSL to Library Path

echo "/usr/local/ssl/lib" | sudo tee -a /etc/ld.so.conf.d/openssl-1.1.1w.conf
sudo ldconfig

5.2 Update System Paths

Modify your environment variables to prioritize the new OpenSSL:

echo 'export PATH="/usr/local/ssl/bin:$PATH"' | sudo tee -a /etc/profile.d/openssl.sh
source /etc/profile.d/openssl.sh

6. Verify Installation

Check if the new OpenSSL version is in use:

openssl version -a

You should see OpenSSL 1.1.1w and the correct installation path.