add libx11-dev to INSTALL instructions

diff --git a/INSTALL b/INSTALL
index 3f44e160d209cb3e74306a8edb85f1b5fdb930fd..78ca13ad0f3ad7f440220953e5882c93c55ea4ac 100644 (file)
--- a/INSTALL
+++ b/INSTALL
@@ -8,7 +8,7 @@ Install Prerequisites
 been ported to Xerces 3. For Debian or Ubuntu, the required packages
 can be installed with the following
 
-$ sudo apt install build-essential libxerces-c-dev wget
+$ sudo apt install wget build-essential libx11-dev libxerces-c-dev
 
 2. Run the following command