update build.sh and CONTRIBUTING.md

CONTRIBUTING.md

@@ -37,7 +37,7 @@ Before we get started, here are a few things we expect from you (and that you sh
 
 ## How to contribute
 
-If you'd like to contribute, start by searching through the [issues](https://github.com/MyHush/hush3/issues) and [pull requests](https://github.com/MyHush/hush3/pulls) to see whether someone else has raised a similar idea or question.
+If you'd like to contribute, start by searching through the [issues](https://git.hush.is/hush/hush3/issues) and [pull requests](https://git.hush.is/hush/hush3/pulls) to see whether someone else has raised a similar idea or question.
 
 If you don't see your idea listed, and you think it can contribute to Hush, do one of the following:
 * **If your contribution is minor,** such as a fixing a typo, open a pull request.
@@ -49,7 +49,7 @@ Don't write shitty code. Do not emulate "jl777 code style" from Komodo, we consi
 
 ## Setting up your environment
 
-The Hush Core (hushd) is mainly written in C++ with specific modules written in C. Follow the [Install](https://github.com/MyHush/hush3/blob/master/INSTALL.md) instructions to build hushd from sources. For more informations about the Hush Platform and a full API documentation please visit the official [Hush Developer documentation](https://gilardh.github.io/dev-website/developers/)
+The Hush Core (hushd) is mainly written in C++ with specific modules written in C. Follow the [Install](https://git.hush.is/hush/hush3/src/branch/master/INSTALL.md) instructions to build hushd from sources. For more informations about the Hush Platform and a full API documentation please visit the official [Hush Developer documentation](https://faq.hush.is/rpc/)
 
 Other Hush software is written in Rust or Go. We avoid Javascript at all costs.
 

INSTALL.md

@@ -25,7 +25,7 @@ sudo swapon /swapfile
 # install build dependencies
 sudo apt-get install build-essential pkg-config libc6-dev m4 g++-multilib \
       autoconf libtool ncurses-dev unzip git python zlib1g-dev wget \
-      bsdmainutils automake curl unzip nano libsodium-dev
+      bsdmainutils automake curl unzip nano libsodium-dev cmake
 # clone git repo
 git clone https://git.hush.is/hush/hush3
 cd hush3

zcutil/build.sh

@@ -5,6 +5,12 @@
 
 set -eu -o pipefail
 
+# Check if cmake, a new dependency for randomx support, is installed on system and exits if it is not
+if ! [ -x "$(command -v cmake)" ]; then
+  echo 'Error: cmake is not installed. Install cmake and try again.' >&2
+  exit 1
+fi
+
 function cmd_pref() {
     if type -p "$2" > /dev/null; then
         eval "$1=$2"