From 59ac7ce66066736db6781abe0378a753fad15127 Mon Sep 17 00:00:00 2001
From: Kornel Benko <kornel@lyx.org>
Date: Mon, 11 Jul 2016 19:08:11 +0200
Subject: [PATCH] Cmake build: Add needed libraries if using QT5_Extras

Commit cb0c881 does this already for automake.
---
 development/cmake/ConfigureChecks.cmake | 1 +
 src/CMakeLists.txt                      | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/development/cmake/ConfigureChecks.cmake b/development/cmake/ConfigureChecks.cmake
index c9c7b74b87..146330a56a 100644
--- a/development/cmake/ConfigureChecks.cmake
+++ b/development/cmake/ConfigureChecks.cmake
@@ -241,6 +241,7 @@ if(LYX_USE_QT MATCHES "QT5")
             "
       QT_HAS_X11_EXTRAS)
     set(HAVE_QT5_X11_EXTRAS ${QT_HAS_X11_EXTRAS})
+    set(LYX_QT5_X11_EXTRAS_LIBRARY ${_x11extra_link_libraries})
   endif()
   if (Qt5WinExtras_FOUND)
     get_target_property(_winextra_prop Qt5::WinExtras IMPORTED_CONFIGURATIONS)
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 0a131c99ed..ffcb34debd 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -134,6 +134,14 @@ target_link_libraries(${_lyx}
 
 qt_use_modules(${_lyx} Core Gui)
 
+if(QT_HAS_X11_EXTRAS)
+  find_library(XCB_LIBRARY NAMES xcb)
+  if (XCB_LIBRARY MATCHES "NOTFOUND")
+    message(FATAL_ERROR "Need xcb library to use with QT5_X11_EXTRAS")
+  endif()
+  target_link_libraries(${_lyx} ${LYX_QT5_X11_EXTRAS_LIBRARY} ${XCB_LIBRARY})
+endif()
+
 lyx_target_link_libraries(${_lyx} HUNSPELL ASPELL ENCHANT Magic)
 
 if(APPLE)