--- CMakeLists.txt.orig
+++ CMakeLists.txt
@@ -61,9 +61,10 @@
 set(CMAKE_CXX_EXTENSIONS ON)
 
 if (CMAKE_SYSTEM MATCHES "Darwin")
-    set(CMAKE_OSX_DEPLOYMENT_TARGET "${MACOS_VERSION_MIN}" CACHE STRING "Minimum OS X deployment version" FORCE)
-    set(CMAKE_CXX_FLAGS "-Wno-deprecated-register -mmacosx-version-min=${MACOS_VERSION_MIN} ${CMAKE_CXX_FLAGS}")
-    set(CMAKE_C_FLAGS "-Wno-deprecated-register -mmacosx-version-min=${MACOS_VERSION_MIN} ${CMAKE_C_FLAGS}")
+    # disable settings that MacPorts sets
+    # set(CMAKE_OSX_DEPLOYMENT_TARGET "${MACOS_VERSION_MIN}" CACHE STRING "Minimum OS X deployment version" FORCE)
+    # set(CMAKE_CXX_FLAGS "-Wno-deprecated-register -mmacosx-version-min=${MACOS_VERSION_MIN} ${CMAKE_CXX_FLAGS}")
+    # set(CMAKE_C_FLAGS "-Wno-deprecated-register -mmacosx-version-min=${MACOS_VERSION_MIN} ${CMAKE_C_FLAGS}")
     find_library(CORESERVICES_LIB CoreServices)
     set(EXTRA_LIBS ${CORESERVICES_LIB})
 endif()