diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5f0bf8293c..9d7da1644d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -14,6 +14,11 @@ list( APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR} )
 include( CreateLaunchers )
 include( FindPackageHandleStandardArgs )
 
+# Produce a warning if XP support will be missing.
+if( MSVC14 AND NOT CMAKE_GENERATOR_TOOLSET STREQUAL "v140_xp" )
+	message( WARNING "This project supports Windows XP (including XP x64), but you must set the optional toolset to v140_xp manually to have it in your build! Use -T \"v140_xp\" from the command prompt." )
+endif()
+
 # Support cross compiling
 option( FORCE_CROSSCOMPILE "Turn on cross compiling." NO )
 if( FORCE_CROSSCOMPILE )