dev-cpp/gtest requires c++ 17+
https://github.com/jbeder/yaml-cpp/pull/1374

--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -105,7 +105,7 @@ target_include_directories(yaml-cpp
 if (NOT DEFINED CMAKE_CXX_STANDARD)
   set_target_properties(yaml-cpp
     PROPERTIES
-      CXX_STANDARD 11)
+      CXX_STANDARD 17)
 endif()
 
 if(YAML_CPP_MAIN_PROJECT)
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -49,7 +49,7 @@ target_link_libraries(yaml-cpp-tests
 
 set_property(TARGET yaml-cpp-tests PROPERTY CXX_STANDARD_REQUIRED ON)
 if (NOT DEFINED CMAKE_CXX_STANDARD)
-  set_target_properties(yaml-cpp-tests PROPERTIES CXX_STANDARD 11)
+  set_target_properties(yaml-cpp-tests PROPERTIES CXX_STANDARD 17)
 endif()