From aa9d3c9a503952589b359624bbb0da11dd7a5e3f Mon Sep 17 00:00:00 2001
From: Steven <steven@sigwo.com>
Date: Sat, 15 Oct 2016 13:57:19 -0400
Subject: [PATCH] add software-properties-common

This allows using `add-apt-repository`.
---
 doc/build-unix.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/doc/build-unix.md b/doc/build-unix.md
index 5202072f8..a7221ddc6 100644
--- a/doc/build-unix.md
+++ b/doc/build-unix.md
@@ -82,6 +82,7 @@ install necessary parts of boost:
 BerkeleyDB is required for the wallet. db4.8 packages are available [here](https://launchpad.net/~bitcoin/+archive/bitcoin).
 You can add the repository and install using the following commands:
 
+    sudo apt-get install software-properties-common
     sudo add-apt-repository ppa:bitcoin/bitcoin
     sudo apt-get update
     sudo apt-get install libdb4.8-dev libdb4.8++-dev