New parameter DEP_WX_GTK3=on/off to build wxWidgets against GTK3.

deps/deps-linux.cmake

@@ -99,6 +99,12 @@ else ()
     set(DEP_WX_TAG "v3.1.1-patched")
 endif()
 
+if (DEP_WX_GTK3)
+    set(WX_GTK_VERSION "3")
+else ()
+    set(WX_GTK_VERSION "2")
+endif()
+
 ExternalProject_Add(dep_wxwidgets
     EXCLUDE_FROM_ALL 1
     GIT_REPOSITORY "https://github.com/prusa3d/wxWidgets"
@@ -108,7 +114,7 @@ ExternalProject_Add(dep_wxwidgets
     CONFIGURE_COMMAND ./configure
         "--prefix=${DESTDIR}/usr/local"
         --disable-shared
-        --with-gtk=2
+        --with-gtk=${WX_GTK_VERSION}
         --with-opengl
         --enable-unicode
         --enable-graphics_ctx