Update instructions on building/installing BLAKE3 library

README.md

@@ -335,9 +335,21 @@ or [LLVM Clang 17](https://clang.llvm.org/) (or later) is required.
 * [OpenSSL](https://www.openssl.org/) 3+
 * [Sodium](https://libsodium.org/) 1.0.18+
 * [GCrypt](https://gnupg.org/software/libgcrypt/index.html) 1.10+
-* [BLAKE3](https://github.com/BLAKE3-team/BLAKE3) 1.4+
+* [BLAKE3](https://github.com/BLAKE3-team/BLAKE3) 1.4+ (see the note below)
 * [GNU Readline](https://tiswww.case.edu/php/chet/readline/rltop.html) 8+
 
+### IMPORTANT: A note on installing/building BLAKE3
+
+BLAKE3 is not available in the package repositories of most Linux distributions,
+so you will need to build it from source and install it manually.
+
+You can run [install_blake3.sh](./install_blake3.sh) script to install BLAKE3 automatically,
+Or you can follow the steps at [BLAKE3's GitHub page](https://github.com/BLAKE3-team/BLAKE3/blob/master/c/README.md#building)
+
+Another option is to install BLAKE3 using a package manager, such as [Vcpkg](https://vcpkg.io): `vcpkg install blake3`.
+
+**Installing with the script is recommended, as it will also set up the required CMake module for BLAKE3 automatically.**
+
 ### Installation/Building
 
 After installing the prerequisites, you can install Privacy Shield by following the steps below:

install_blake3.sh

@@ -0,0 +1,12 @@
+#!/bin/env bash
+
+# This script is used to build and install BLAKE3 on Unix-like systems.
+# Requires CMake, Ninja, and GCC (or a compatible C compiler) to be installed.
+
+# Clone the repository
+git clone https://github.com/BLAKE3-team/BLAKE3.git
+
+# Build and install BLAKE3
+cd BLAKE3/c || echo "Failed to find BLAKE3/c directory" && exit
+cmake -B build -DCMAKE_C_COMPILER=gcc -G Ninja
+sudo cmake --build build --config Release --target install -j 4