diff --git a/CMakeLists.txt b/CMakeLists.txt
index e4e177f..6408971 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,7 +2,12 @@ cmake_minimum_required(VERSION 2.8.0)
 project(mumlib)
 
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
-add_definitions(-DOPT_TLS_GNUTLS -D_POSIX_C_SOURCE=200112L)
+
+if (NOT APPLE)
+  add_definitions(-DOPT_TLS_GNUTLS -D_POSIX_C_SOURCE=200112L)
+else()
+  LINK_DIRECTORIES(/opt/local/lib) # Include the default MacPorts library directory
+endif()
 
 INCLUDE(FindPkgConfig)
 find_package(PkgConfig REQUIRED)