diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3d61db9..26df32f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -23,12 +23,14 @@ option(OMATH_SUPRESS_SAFETY_CHECKS "Supress some safety checks in release build
 option(OMATH_USE_UNITY_BUILD "Will enable unity build to speed up compilation" OFF)
 option(OMATH_ENABLE_LEGACY "Will enable legacy classes that MUST be used ONLY for backward compatibility" OFF)
 
-if (CMAKE_TOOLCHAIN_FILE)
+if (CMAKE_TOOLCHAIN_FILE AND VCPKG_MANIFEST_FEATURES)
     foreach (omath_feature IN LISTS VCPKG_MANIFEST_FEATURES)
         if (omath_feature STREQUAL "imgui")
             set(OMATH_IMGUI_INTEGRATION ON)
         elseif (omath_feature STREQUAL "avx2")
             set(OMATH_USE_AVX2 ${COMPILER_SUPPORTS_AVX2})
+        else()
+            message(WARNING "[${PROJECT_NAME}]: UNKNOWN VCPKG LIBRARY FEATURE CALLED \"${omath_feature}\" ")
         endif ()
     endforeach ()
 endif ()