Include sys/sysctl.h on all architectures not only i386.

usr.bin/make/Makefile

@@ -13,6 +13,7 @@ SRCS+=	lstAppend.c lstAtEnd.c lstAtFront.c lstClose.c lstConcat.c \
 	lstMember.c lstNext.c lstOpen.c lstRemove.c lstReplace.c lstSucc.c
 .PATH:	${.CURDIR}/lst.lib
 
+WARNS?=	3
 NOSHARED?=	YES
 
 CFLAGS+=-DMAKE_VERSION=\"5200408120\"

usr.bin/make/main.c

@@ -63,9 +63,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/param.h>
 #include <sys/signal.h>
 #include <sys/stat.h>
-#if defined(__i386__)
 #include <sys/sysctl.h>
-#endif
 #include <sys/time.h>
 #include <sys/resource.h>
 #ifndef MACHINE