From a560810747f556f7ec9d075018160f8b743dca9d Mon Sep 17 00:00:00 2001
From: Vasily <vautkin@teknik.io>
Date: Mon, 29 Jul 2019 02:40:18 +0200
Subject: [PATCH] Downgrade gcc version on AppImage build to 7 from 9

As described in issue
https://github.com/OpenVR-Advanced-Settings/OpenVR-AdvancedSettings/issues/266
the gcc-9 libstdc++ version is not included in Ubuntu 18.04 or
derivatives, which leads to a runtime error.

gcc-7 is the oldest version that has c++17 support. If we didn't need
C++17 support then we could use gcc-5, which is included with Ubuntu
14.04.
---
 .circleci/config.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.circleci/config.yml b/.circleci/config.yml
index b6f00d0..a564638 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -111,7 +111,7 @@ jobs:
                 command: |
                     sudo add-apt-repository ppa:ubuntu-toolchain-r/test
                     sudo apt-get update
-                    sudo apt-get install g++-9 -y
+                    sudo apt-get install g++-7 -y
             - run:
                 name: Add required QT repos
                 command: |