https://gitlab.kitware.com/diatomic/diy/-/merge_requests/59

From bb0d55c8ae34a43354b1002262dad722c410d8cb Mon Sep 17 00:00:00 2001
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date: Sat, 13 Jun 2020 13:59:31 +0200
Subject: [PATCH] Fix build on mach-based OS which are not OS X

---
 include/diy/time.hpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/ThirdParty/diy2/vtkdiy2/include/vtkdiy2/time.hpp b/ThirdParty/diy2/vtkdiy2/include/vtkdiy2/time.hpp
index 692cf36..671e69d 100644
--- a/ThirdParty/diy2/vtkdiy2/include/vtkdiy2/time.hpp
+++ b/ThirdParty/diy2/vtkdiy2/include/vtkdiy2/time.hpp
@@ -3,11 +3,11 @@
 
 #ifndef _WIN32
 #include <sys/time.h>
-#ifdef __MACH__
+#if defined(__MACH__) && defined(__APPLE__)
 #include <mach/clock.h>
 #include <mach/mach.h>
-#endif // __MACH__
+#endif // __MACH__ && __APPLE__
 #endif // ifndef _WIN32
 
 namespace diy
 {
@@ -16,7 +16,7 @@ typedef     unsigned long       time_type;
 
 inline time_type get_time()
 {
-#ifdef __MACH__ // OS X does not have clock_gettime, use clock_get_time
+#if defined(__MACH__) && defined(__APPLE__) // OS X does not have clock_gettime, use clock_get_time
     clock_serv_t cclock;
     mach_timespec_t ts;
     host_get_clock_service(mach_host_self(), CALENDAR_CLOCK, &cclock);
-- 
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