From db7d068d3cd872a77d761f4ef936276b265fd54c Mon Sep 17 00:00:00 2001
From: pfirpfel <michaelkuenzli@gmail.com>
Date: Wed, 20 Apr 2022 08:24:19 +0200
Subject: [PATCH] Only install xvfb if not available

---
 .github/workflows/test-build.yaml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/test-build.yaml b/.github/workflows/test-build.yaml
index 6feb80d461a..48082ff9a2b 100644
--- a/.github/workflows/test-build.yaml
+++ b/.github/workflows/test-build.yaml
@@ -19,8 +19,8 @@ jobs:
           java-version: ${{ matrix.java }}
           cache: 'maven'
 
-      - name: Install virtual framebuffer to allow running GUI on a headless server
-        run: sudo apt update && sudo apt install -y xvfb
+      - name: Install virtual framebuffer (if not available) to allow running GUI on a headless server
+        run: command -v Xvfb >/dev/null 2>&1 || { sudo apt update && sudo apt install -y xvfb; }
 
       - name: Run tests in virtual framebuffer
         run: |