diff --git a/ext/src/dll/CMakeLists.txt b/ext/src/dll/CMakeLists.txt
index a4e2e06a13..1fa8de354e 100644
--- a/ext/src/dll/CMakeLists.txt
+++ b/ext/src/dll/CMakeLists.txt
@@ -6,8 +6,8 @@ set(OPENTELEMETRY_EXPORT_DEF
 
 add_library(opentelemetry_cpp SHARED dllmain.cc ${OPENTELEMETRY_EXPORT_DEF})
 
-if(WITH_STL)
-  add_compile_definitions(WITH_STL)
+if(OPENTELEMETRY_STL_VERSION)
+  add_compile_definitions(OPENTELEMETRY_STL_VERSION)
 endif()
 
 target_link_libraries(
diff --git a/ext/src/dll/opentelemetry_cpp.src b/ext/src/dll/opentelemetry_cpp.src
index 327815ddcd..15b493fa19 100644
--- a/ext/src/dll/opentelemetry_cpp.src
+++ b/ext/src/dll/opentelemetry_cpp.src
@@ -73,17 +73,19 @@ EXPORTS
     // public: static class std::unique_ptr<class opentelemetry::v1::sdk::metrics::View,struct std::default_delete<class opentelemetry::v1::sdk::metrics::View> > __cdecl opentelemetry::v1::sdk::metrics::ViewFactory::Create(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,enum opentelemetry::v1::sdk::metrics::AggregationType)
     ?Create@ViewFactory@metrics@sdk@v1@opentelemetry@@SA?AV?$unique_ptr@VView@metrics@sdk@v1@opentelemetry@@U?$default_delete@VView@metrics@sdk@v1@opentelemetry@@@std@@@std@@AEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@7@00W4AggregationType@2345@@Z
 
-#if defined(WITH_STL)
+#if (OPENTELEMETRY_STL_VERSION >= 2017)
+    // For OPENTELEMETRY_STL_VERSION >= 2017: Use C++ Standard Library's std::string_view for exported function definitions.
     // public: static class std::unique_ptr<class opentelemetry::v1::sdk::metrics::MeterSelector,struct std::default_delete<class opentelemetry::v1::sdk::metrics::MeterSelector> > __cdecl opentelemetry::v1::sdk::metrics::MeterSelectorFactory::Create(class std::basic_string_view<char,struct std::char_traits<char> >,class std::basic_string_view<char,struct std::char_traits<char> >,class std::basic_string_view<char,struct std::char_traits<char> >)
     ?Create@MeterSelectorFactory@metrics@sdk@v1@opentelemetry@@SA?AV?$unique_ptr@VMeterSelector@metrics@sdk@v1@opentelemetry@@U?$default_delete@VMeterSelector@metrics@sdk@v1@opentelemetry@@@std@@@std@@V?$basic_string_view@DU?$char_traits@D@std@@@7@00@Z
     // public: static class std::unique_ptr<class opentelemetry::v1::sdk::metrics::InstrumentSelector,struct std::default_delete<class opentelemetry::v1::sdk::metrics::InstrumentSelector> > __cdecl opentelemetry::v1::sdk::metrics::InstrumentSelectorFactory::Create(enum opentelemetry::v1::sdk::metrics::InstrumentType,class std::basic_string_view<char,struct std::char_traits<char> >,class std::basic_string_view<char,struct std::char_traits<char> >)
     ?Create@InstrumentSelectorFactory@metrics@sdk@v1@opentelemetry@@SA?AV?$unique_ptr@VInstrumentSelector@metrics@sdk@v1@opentelemetry@@U?$default_delete@VInstrumentSelector@metrics@sdk@v1@opentelemetry@@@std@@@std@@W4InstrumentType@2345@V?$basic_string_view@DU?$char_traits@D@std@@@7@1@Z
 #else
+    // For OPENTELEMETRY_STL_VERSION < 2017 or undefined: Use nostd::string_view for exported function definitions.
     // public: static class std::unique_ptr<class opentelemetry::v1::sdk::metrics::MeterSelector,struct std::default_delete<class opentelemetry::v1::sdk::metrics::MeterSelector> > __cdecl opentelemetry::v1::sdk::metrics::MeterSelectorFactory::Create(class opentelemetry::v1::nostd::string_view,class opentelemetry::v1::nostd::string_view,class opentelemetry::v1::nostd::string_view)
     ?Create@MeterSelectorFactory@metrics@sdk@v1@opentelemetry@@SA?AV?$unique_ptr@VMeterSelector@metrics@sdk@v1@opentelemetry@@U?$default_delete@VMeterSelector@metrics@sdk@v1@opentelemetry@@@std@@@std@@Vstring_view@nostd@45@00@Z
     // public: static class std::unique_ptr<class opentelemetry::v1::sdk::metrics::InstrumentSelector,struct std::default_delete<class opentelemetry::v1::sdk::metrics::InstrumentSelector> > __cdecl opentelemetry::v1::sdk::metrics::InstrumentSelectorFactory::Create(enum opentelemetry::v1::sdk::metrics::InstrumentType,class opentelemetry::v1::nostd::string_view,class opentelemetry::v1::nostd::string_view)
     ?Create@InstrumentSelectorFactory@metrics@sdk@v1@opentelemetry@@SA?AV?$unique_ptr@VInstrumentSelector@metrics@sdk@v1@opentelemetry@@U?$default_delete@VInstrumentSelector@metrics@sdk@v1@opentelemetry@@@std@@@std@@W4InstrumentType@2345@Vstring_view@nostd@45@1@Z
-#endif  // defined(WITH_STL)
+#endif  // (OPENTELEMETRY_STL_VERSION >= 2017)
 
     // public: void __cdecl opentelemetry::v1::sdk::metrics::MeterContext::AddMetricReader(class std::shared_ptr<class opentelemetry::v1::sdk::metrics::MetricReader>)
     ?AddMetricReader@MeterContext@metrics@sdk@v1@opentelemetry@@QEAAXV?$shared_ptr@VMetricReader@metrics@sdk@v1@opentelemetry@@@std@@@Z