From 81a5bd977b3c3aaba5fe72ae76f07f48a42fa286 Mon Sep 17 00:00:00 2001
From: Seth Hillbrand <hillbrand@ucdavis.edu>
Date: Sun, 24 Feb 2019 22:13:04 -0800
Subject: [PATCH] Force overlay when building GTK3

GTK3 does not provide the XOR method.  We need to force the overlay to
draw items in Page Layout editor when moving/dragging
---
 CMakeLists.txt | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6c907176e0..c170e76bd5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -64,7 +64,7 @@ option( USE_WX_GRAPHICS_CONTEXT
     "Use wxGraphicsContext for rendering (default OFF).  Warning, this is experimental" )
 
 option( USE_WX_OVERLAY
-    "Use wxOverlay: Always ON for MAC (default OFF).  Warning, this is experimental" )
+    "Use wxOverlay: Always ON for MAC and GTK3 (default OFF)." )
 
 option( KICAD_SCRIPTING
     "Build the Python scripting support inside KiCad binaries (default ON)."
@@ -781,6 +781,10 @@ find_package( wxWidgets ${wxWidgets_REQ_VERSION} COMPONENTS gl aui adv html core
 # Include wxWidgets macros.
 include( ${wxWidgets_USE_FILE} )
 
+# Check for GTK3 libraries - These do not have XOR, so we need overlay (Page layout editor)
+if( wxWidgets_LIBRARIES MATCHES "gtk3" )
+    add_definitions( -DUSE_WX_OVERLAY )
+endif()
 
 if( KICAD_SCRIPTING_WXPYTHON AND NOT KICAD_SCRIPTING_WXPYTHON_PHOENIX )
     # wxPython appears to be installed and valid so make sure the headers are available.