--- ./intern/cycles/CMakeLists.txt.orig	2021-04-16 20:47:50.466754473 +0200
+++ ./intern/cycles/CMakeLists.txt	2021-04-16 20:48:06.199903232 +0200
@@ -336,7 +336,7 @@ endif()
 # Warnings
 if(CMAKE_COMPILER_IS_GNUCXX)
   ADD_CHECK_CXX_COMPILER_FLAG(CMAKE_CXX_FLAGS _has_cxxflag_float_conversion "-Werror=float-conversion")
-  ADD_CHECK_CXX_COMPILER_FLAG(CMAKE_CXX_FLAGS _has_cxxflag_double_promotion "-Werror=double-promotion")
+  #ADD_CHECK_CXX_COMPILER_FLAG(CMAKE_CXX_FLAGS _has_cxxflag_double_promotion "-Werror=double-promotion")
   ADD_CHECK_CXX_COMPILER_FLAG(CMAKE_CXX_FLAGS _has_no_error_unused_macros "-Wno-error=unused-macros")
   unset(_has_cxxflag_float_conversion)
   unset(_has_cxxflag_double_promotion)