--- util/memory.cpp.orig	2021-08-17 11:14:21.000000000 -0700
+++ util/memory.cpp	2021-08-17 11:15:10.000000000 -0700
@@ -71,6 +71,14 @@
 
 #if defined(__APPLE__)
 #include <mach/mach.h>
+
+#if MAC_OS_X_VERSION_MAX_ALLOWED < 1080
+#  define MACH_TASK_BASIC_INFO_COUNT TASK_BASIC_INFO_COUNT
+#  define mach_task_basic_info_data_t task_basic_info_data_t
+#  define MACH_TASK_BASIC_INFO TASK_BASIC_INFO
+#  define mach_task_basic_info task_basic_info
+#endif
+
 #endif
 
 namespace lean {