https://bugs.gentoo.org/840263
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -176,7 +176,6 @@
 macro(jerry_add_compile_warnings)
   foreach(_warning ${ARGV})
     jerry_add_compile_flags(-W${_warning})
-    jerry_add_compile_flags(-Werror=${_warning})
   endforeach()
 endmacro()
 
@@ -224,7 +223,7 @@
   if(NOT "${PLATFORM}" STREQUAL "WINDOWS")
     jerry_add_compile_warnings(conversion)
   endif()
-  jerry_add_compile_flags(-Wno-stack-protector -Wno-attributes -Werror)
+  jerry_add_compile_flags(-Wno-stack-protector -Wno-attributes)
 endif()
 
 if(USING_GCC)