macos fix

cmake/libraries.cmake

@@ -4,7 +4,11 @@ set(Boost_USE_STATIC_LIBS ${PROJECT_STATIC_LINK})
 set(CURL_USE_STATIC_LIBS ${PROJECT_STATIC_LINK})
 set(OPENSSL_USE_STATIC_LIBS ${PROJECT_STATIC_LINK})
 set(SFML_STATIC_LIBRARIES ${PROJECT_STATIC_LINK})
-set(ZLIB_USE_STATIC_LIBS ${PROJECT_STATIC_LINK})
+if (PROJECT_IS_DARWIN)
+  set(ZLIB_USE_STATIC_LIBS OFF)
+else()
+  set(ZLIB_USE_STATIC_LIBS ${PROJECT_STATIC_LINK})
+endif()
 set(wxWidgets_USE_STATIC ${PROJECT_STATIC_LINK})
 
 include(cmake/libraries/openssl.cmake)