diff --git a/CMakeLists.txt b/CMakeLists.txt
index a0ee6fbc43..4b40ba538c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -47,10 +47,14 @@ if(MSVC)
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /MP")
 elseif(APPLE)
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -stdlib=libc++") 
-    message(STATUS "Targeting both arm64 and x86_64.")
-    set(CMAKE_OSX_ARCHITECTURES "arm64;x86_64")
-    message(STATUS "Targeting MacOS 12.0.")
-    set(CMAKE_OSX_DEPLOYMENT_TARGET "12.0")
+    if(NOT DEFINED CMAKE_OSX_ARCHITECTURES)
+        message(STATUS "Targeting both arm64 and x86_64.")
+        set(CMAKE_OSX_ARCHITECTURES "arm64;x86_64")
+    endif()
+    if(NOT DEFINED CMAKE_OSX_DEPLOYMENT_TARGET)
+        message(STATUS "Targeting MacOS 12.0.")
+        set(CMAKE_OSX_DEPLOYMENT_TARGET "12.0")
+    endif()
 elseif(UNIX AND NOT APPLE AND NOT ANDROID)
     add_definitions(
         #-std=c++11