From bee292579a4c56a9a66baa478ed9bf2afb281c5a Mon Sep 17 00:00:00 2001
From: Guido Falsi <mad@madpilot.net>
Date: Tue, 29 Apr 2025 17:02:01 +0200
Subject: [PATCH] Disable GPU when running headless

On FreeBSD this prevents a failure when building with Qt 6.9

Adding the env only if `isbsd`, but this could be needed for other OSes too.
---
 src/calibre/gui2/__init__.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/calibre/gui2/__init__.py b/src/calibre/gui2/__init__.py
index 5d30fd3fbd..d374b90f8c 100644
--- a/src/calibre/gui2/__init__.py
+++ b/src/calibre/gui2/__init__.py
@@ -1619,6 +1619,8 @@ def ensure_app(headless=True):
             has_headless = ismacos or islinux or isbsd
             if headless and has_headless:
                 args += ['-platformpluginpath', plugins_loc, '-platform', os.environ.get('CALIBRE_HEADLESS_PLATFORM', 'headless')]
+                if isbsd:
+                    os.environ['QTWEBENGINE_CHROMIUM_FLAGS'] = '--disable-gpu'
                 if ismacos:
                     os.environ['QT_MAC_DISABLE_FOREGROUND_APPLICATION_TRANSFORM'] = '1'
             if headless and iswindows: