From 94f98294def4dc52fed6cf4c70149b62b8193b72 Mon Sep 17 00:00:00 2001
From: James Turner <zakalawe@mac.com>
Date: Wed, 24 Jun 2020 16:36:45 +0100
Subject: [PATCH] Workaround Fedora Qt packaging bug

Use a manual include file, instead of the official method, to check
if the Qt5 private headers are installed or not.
---
 CMakeLists.txt | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4e6623fc9..45e401922 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,6 +5,7 @@ include (CheckVariableExists)
 include (CheckCSourceCompiles)
 include (CheckCXXSourceCompiles)
 include (CheckIncludeFile)
+include (CheckIncludeFileCXX)
 
 cmake_policy(SET CMP0054 NEW)
 cmake_policy(SET CMP0042 NEW) # Mac RPATH policy
@@ -379,7 +380,13 @@ if (ENABLE_QT)
         set(ENABLE_FGQCANVAS OFF)
     endif()
 
-    if (TARGET Qt5::GuiPrivate)
+    # we would ideally use TARGET::Qt5GuiPrivate but Fedora broke it
+    # perform a manual check instead
+    # see https://bugzilla.redhat.com/show_bug.cgi?id=1846613
+    set (CMAKE_REQUIRED_INCLUDES ${Qt5Gui_PRIVATE_INCLUDE_DIRS} ${Qt5Gui_INCLUDE_DIRS})
+    check_include_file_cxx("private/qopenglcontext_p.h" REALLY_HAVE_QGUIPRIVATE)
+
+    if (REALLY_HAVE_QGUIPRIVATE)
         message(STATUS "Have QtGUI private headers")
         set(ENABLE_QQ_UI 1)
     else()