Index: head/stand/efi/Makefile
===================================================================
--- head/stand/efi/Makefile
+++ head/stand/efi/Makefile
@@ -8,10 +8,7 @@
 # than 4.5 supports it.
 .if ${COMPILER_TYPE} != "gcc" || ${COMPILER_VERSION} >= 40500
 
-.if ${MK_FDT} != "no"
-SUBDIR+=	fdt
-.endif
-
+SUBDIR.${MK_FDT}+=	fdt
 SUBDIR+=	libefi loader boot1
 
 .endif # ${COMPILER_TYPE} != "gcc" || ${COMPILER_VERSION} >= 40500
Index: head/stand/i386/Makefile
===================================================================
--- head/stand/i386/Makefile
+++ head/stand/i386/Makefile
@@ -7,9 +7,7 @@
 SUBDIR=		mbr pmbr boot0 boot0sio btx boot2 cdboot gptboot \
 		libi386
 
-.if ${MK_LOADER_FIREWIRE} == "yes"
-SUBDIR+=	libfirewire
-.endif
+SUBDIR.${MK_LOADER_FIREWIRE}+=	libfirewire
 
 SUBDIR+=	loader
 
@@ -20,8 +18,6 @@
 SUBDIR+=	kgzldr
 .endif
 
-.if ${MK_ZFS} != "no"
-SUBDIR+=	zfsboot gptzfsboot zfsloader
-.endif
+SUBDIR.${MK_ZFS}+=	zfsboot gptzfsboot zfsloader
 
 .include <bsd.subdir.mk>
Index: head/stand/powerpc/Makefile
===================================================================
--- head/stand/powerpc/Makefile
+++ head/stand/powerpc/Makefile
@@ -5,8 +5,6 @@
 .include <bsd.init.mk>
 
 SUBDIR=		boot1.chrp ofw uboot
-.if ${MK_FDT} == "yes"
-SUBDIR+=	kboot
-.endif
+SUBDIR.${MK_FDT}+=	kboot
 
 .include <bsd.subdir.mk>
Index: head/stand/sparc64/Makefile
===================================================================
--- head/stand/sparc64/Makefile
+++ head/stand/sparc64/Makefile
@@ -5,8 +5,6 @@
 .include <bsd.init.mk>
 
 SUBDIR=	boot1 loader
-.if ${MK_ZFS} != "no"
-SUBDIR+=zfsboot zfsloader
-.endif
+SUBDIR.${MK_ZFS}+=zfsboot zfsloader
 
 .include <bsd.subdir.mk>
Index: head/stand/uboot/Makefile
===================================================================
--- head/stand/uboot/Makefile
+++ head/stand/uboot/Makefile
@@ -4,8 +4,6 @@
 
 SUBDIR=	lib
 
-.if ${MK_FDT} != "no"
-SUBDIR+=fdt
-.endif
+SUBDIR.${MK_FDT}+=fdt
 
 .include <bsd.subdir.mk>