--- mixxx-2.3.0/CMakeLists.txt
+++ mixxx-2.3.0/CMakeLists.txt
@@ -53,8 +53,6 @@
     set(CMAKE_BUILD_TYPE "${default_build_type}" CACHE STRING "Choose the type of build." FORCE)
     # Set the possible values of build type for cmake-gui
     set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS "Debug" "Release" "RelWithDebInfo")
-  elseif(NOT CMAKE_BUILD_TYPE MATCHES "^(Debug|Release|RelWithDebInfo)$")
-    message(FATAL_ERROR "CMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE} is not supported, use one of Debug, Release or RelWithDebInfo.")
   endif()
 endif()