diff --git a/.travis.yml b/.travis.yml
index 19d3e34033d..64af41145cf 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,6 +7,7 @@ install: export CXX="g++-7"
 os:
 - linux
 before_script:
+  - g++ --version
   - sudo apt-get install libegl1-mesa-dev libgles2-mesa-dev
   - sudo apt-get install cmake lua5.1-dev libssl-dev libogg-dev libtheora-dev libvorbis-dev libsdl2-dev liblzo2-dev libjpeg-dev libncurses5-dev
   - mkdir bin
diff --git a/doc/howto/build-linux.txt b/doc/howto/build-linux.txt
index f1f9771b109..289266f4b6f 100644
--- a/doc/howto/build-linux.txt
+++ b/doc/howto/build-linux.txt
@@ -2,7 +2,6 @@ TITLE: X-Ray 1.6 build and setup on Linux
 
 Required packages:
 ------
-Lua51
 OpenSSL
 Theora
 OGG
@@ -11,7 +10,7 @@ LZO
 JPEG
 
 Ubuntu 18.04 build dependencies:
-sudo apt install git cmake lua5.1-dev libssl-dev libogg-dev libtheora-dev libvorbis-dev libsdl2-dev liblzo2-dev libjpeg-dev libncurses5-dev
+sudo apt install git cmake libssl-dev libogg-dev libtheora-dev libvorbis-dev libsdl2-dev liblzo2-dev libjpeg-dev libncurses5-dev
 
 Build commands:
 ------