https://src.fedoraproject.org/rpms/seamonkey/c/f3de8ae056fcb36615add0e6311cff147fbdd827?branch=master
https://bugs.gentoo.org/736892

--- seamonkey-2.53.2/mozilla/memory/build/mozjemalloc.cpp
+++ seamonkey-2.53.2/mozilla/memory/build/mozjemalloc.cpp
@@ -220,9 +220,6 @@
 #include <sys/param.h>
 #include <sys/time.h>
 #include <sys/types.h>
-#if !defined(XP_SOLARIS) && !defined(ANDROID)
-#include <sys/sysctl.h>
-#endif
 #include <sys/uio.h>
 
 #include <errno.h>