diff --unified --recursive --text mlucas_v19.1/src/platform.h mlucas/src/platform.h
--- mlucas_v19.1/src/platform.h	2021-01-26 20:15:59.000000000 -0500
+++ mlucas/src/platform.h	2021-02-15 14:58:45.798283597 -0500
@@ -1304,7 +1304,7 @@
 		#include <sched.h>
 
 	  #ifndef OS_TYPE_GNU_HURD
-		#include <sys/sysctl.h>
+//#include <sys/sysctl.h>
 	  #endif
 		#include <unistd.h>	// Needed for Posix sleep() command, among other things
 		#ifdef OS_TYPE_LINUX
Only in mlucas/src: platform.h~