diff --git a/runtime/CMakeLists.txt b/runtime/CMakeLists.txt
index 823307ad..55636cf1 100644
--- a/runtime/CMakeLists.txt
+++ b/runtime/CMakeLists.txt
@@ -29,6 +29,9 @@ set(D_FLAGS -g -w -d CACHE STRING "runtime build flags, separated by ;")
 
 if(BUILD_SHARED_LIBS)
     list(APPEND D_FLAGS -relocation-model=pic)
+    if(APPLE)
+      list(APPEND LD_FLAGS -Wl,-undefined,dynamic_lookup)
+    endif()
     set(D_LIBRARY_TYPE SHARED)
 else(BUILD_SHARED_LIBS)
     set(D_LIBRARY_TYPE STATIC)
@@ -352,10 +355,10 @@ endmacro(build_runtime d_flags c_flags ld_flags lib_suffix path_suffix)
 if(PHOBOS2_DIR)
     add_custom_target(phobos2)
 endif(PHOBOS2_DIR)
-build_runtime("" "" "" "" "${LIB_SUFFIX}")
+build_runtime("" "" "${LD_FLAGS}" "" "${LIB_SUFFIX}")
 set(GENERATE_DI "")
 if(MULTILIB)
-    build_runtime("-m${MULTILIB_SUFFIX}" "-m${MULTILIB_SUFFIX}" "-m${MULTILIB_SUFFIX}" "" "${MULTILIB_SUFFIX}")
+    build_runtime("-m${MULTILIB_SUFFIX}" "-m${MULTILIB_SUFFIX}" "-m${MULTILIB_SUFFIX} ${LD_FLAGS}" "" "${MULTILIB_SUFFIX}")
 endif(MULTILIB)
 
 #