diff -urEbwB CGAL-4.11.1/cmake/modules/CGAL_SetupFlags.cmake CGAL-4.11.1.new/cmake/modules/CGAL_SetupFlags.cmake
--- CGAL-4.11.1/cmake/modules/CGAL_SetupFlags.cmake	2018-02-24 21:00:36.000000000 +0100
+++ CGAL-4.11.1.new/cmake/modules/CGAL_SetupFlags.cmake	2018-03-05 12:13:47.233411449 +0100
@@ -61,11 +61,6 @@
   add_definitions(-DCGAL_TEST_SUITE)
 endif()
 
-if ( NOT "${CMAKE_BUILD_TYPE}" STREQUAL "Release" AND NOT "${CMAKE_BUILD_TYPE}" STREQUAL "Debug"
-     AND NOT "${CMAKE_BUILD_TYPE}" STREQUAL "RelWithDebInfo" AND NOT "${CMAKE_BUILD_TYPE}" STREQUAL "MinSizeRel" )
-  message( FATAL_ERROR "${CMAKE_BUILD_TYPE} is not a valid build type: only Release, Debug, RelWithDebInfo or MinSizeRel is allowed" )
-endif()
-
 message( STATUS "Build type: ${CMAKE_BUILD_TYPE}" )
 
 string( TOUPPER "${CMAKE_BUILD_TYPE}" CGAL_BUILD_TYPE_UPPER )