[BUILD] add support for atomic operations not supported by hardware

This change links the dnbd3-server with 'libatomic' to add support for
atomic operations not supported by hardware (especially 32-bit hardware
architectures, such as ARM). Thus the dnbd3-server can also run on a
Raspberry Pi 1 running Rasperry Pi OS.

Note that the dnbd3-server is still linked to the libatomic, even if the
hardware supports atomic operations. In this case, the compiler resolves
atomic operations and replaces them automatically with specific built-in
functions. This unnecessary linkage can be removed in the future if the
GCC supports an upcoming option called automatic linking of libatomic
(--enable-autolink-libatomic).

1 files changed, 14 insertions, 0 deletions

diff --git a/README.md b/README.md
index 1e60477..954fbe9 100644
--- a/README.md
+++ b/README.md
@@ -12,6 +12,7 @@ This repository contains the source code for the following dnbd3 components:
 The dnbd3 components can be built for the following Linux kernel versions and Unix distributions:
 
   - Archlinux with **Linux kernel 5.9.x** or **5.4.x**
+  - Raspberry Pi OS with **Linux kernel 5.4.x**
   - Ubuntu 20.04 with **Linux kernel 5.4.x**
   - Ubuntu 18.04 with **Linux kernel 4.19.x**
   - CentOS 8 with **Linux kernel 4.18.x**
@@ -37,6 +38,19 @@ pacman -S git \
           rpm-tools
 ```
 
+#### Raspberry Pi OS with Linux kernel 5.4.x
+```shell
+apt-get install git \
+                make \
+                cmake \
+                gcc \
+                raspberrypi-kernel-headers \
+				libfuse-dev \
+				libjansson-dev \
+                afl \
+                rpm
+```
+
 #### Ubuntu 20.04 with Linux kernel 5.4.x
 ```shell
 apt-get install git \