diff -Naur firefox-52.9.0esr.orig/memory/mozjemalloc/jemalloc.c firefox-52.9.0esr/memory/mozjemalloc/jemalloc.c
--- firefox-52.9.0esr.orig/memory/mozjemalloc/jemalloc.c	2017-05-12 02:25:50.000000000 +0200
+++ firefox-52.9.0esr/memory/mozjemalloc/jemalloc.c	2020-12-12 22:13:48.502275579 +0100
@@ -331,9 +331,9 @@
 #endif
 #include <sys/time.h>
 #include <sys/types.h>
-#if !defined(MOZ_MEMORY_SOLARIS) && !defined(MOZ_MEMORY_ANDROID)
-#include <sys/sysctl.h>
-#endif
+//#if !defined(MOZ_MEMORY_SOLARIS) && !defined(MOZ_MEMORY_ANDROID)
+//#include <sys/sysctl.h>
+//#endif
 #include <sys/uio.h>
 #ifndef MOZ_MEMORY
 #include <sys/ktrace.h> /* Must come after several other sys/ includes. */