diff --git a/sys/conf/kern.opts.mk b/sys/conf/kern.opts.mk
--- a/sys/conf/kern.opts.mk
+++ b/sys/conf/kern.opts.mk
@@ -62,6 +62,10 @@
     REPRODUCIBLE_BUILD \
     VERIEXEC
 
+__DEFAULT_DEPENDENT_OPTIONS = \
+    REPRODUCIBLE_PATHS/REPRODUCIBLE_BUILD \
+
+
 # Some options are totally broken on some architectures. We disable them. If you
 # need to enable them on an experimental basis, you must change this code.
 # Note: These only apply to the list of modules we build by default and
@@ -174,6 +178,22 @@
 OPT_${opt}:=	${rep}
 .endif
 .endfor
+
+# List of FOO/BAR options, FOO defaults to BAR if not set
+.for vv in ${__DEFAULT_DEPENDENT_OPTIONS}
+.if defined(WITH_${vv:H}) && defined(WITHOUT_${vv:H})
+MK_${vv:H}?= no
+.elif defined(WITH_${vv:H})
+MK_${vv:H}?= yes
+.elif defined(WITHOUT_${vv:H})
+MK_${vv:H}?= no
+.else
+MK_${vv:H}?= ${MK_${vv:T}}
+.endif
+MK_${vv:H}:= ${MK_${vv:H}}
+.endfor
+.undef __DEFAULT_DEPENDENT_OPTIONS
+
 #end of bsd.mkopt.mk expanded inline.
 
 #
diff --git a/sys/conf/kern.post.mk b/sys/conf/kern.post.mk
--- a/sys/conf/kern.post.mk
+++ b/sys/conf/kern.post.mk
@@ -372,7 +372,7 @@
 _ILINKS+= i386
 .endif
 
-.if ${MK_REPRODUCIBLE_BUILD} != "no"
+.if ${MK_REPRODUCIBLE_PATHS} != "no"
 PREFIX_SYSDIR=/usr/src/sys
 PREFIX_OBJDIR=/usr/obj/usr/src/${MACHINE}.${MACHINE_CPUARCH}/sys/${KERN_IDENT}
 CFLAGS+= -ffile-prefix-map=${SYSDIR}=${PREFIX_SYSDIR}
diff --git a/sys/conf/kmod.mk b/sys/conf/kmod.mk
--- a/sys/conf/kmod.mk
+++ b/sys/conf/kmod.mk
@@ -303,7 +303,7 @@
 beforedepend: ${_ILINKS}
 beforebuild: ${_ILINKS}
 
-.if ${MK_REPRODUCIBLE_BUILD} != "no"
+.if ${MK_REPRODUCIBLE_PATHS} != "no"
 PREFIX_SYSDIR=/usr/src/sys
 CFLAGS+= -ffile-prefix-map=${SYSDIR}=${PREFIX_SYSDIR}
 .if defined(KERNBUILDDIR)