diff --git a/include/rpc/Makefile b/include/rpc/Makefile
--- a/include/rpc/Makefile
+++ b/include/rpc/Makefile
@@ -3,7 +3,7 @@
 
 .SUFFIXES: .x
 
-RPCCOM=	RPCGEN_CPP=${CPP:Q} rpcgen -C
+RPCCOM=	RPCGEN_CPP=${CPP:Q} ${RPCGEN} -C
 
 HDRS=	rpcb_prot.h
 
diff --git a/include/rpcsvc/Makefile b/include/rpcsvc/Makefile
--- a/include/rpcsvc/Makefile
+++ b/include/rpcsvc/Makefile
@@ -3,7 +3,7 @@
 
 .SUFFIXES: .x
 
-RPCCOM=	RPCGEN_CPP=${CPP:Q} rpcgen -C
+RPCCOM=	RPCGEN_CPP=${CPP:Q} ${RPCGEN} -C
 
 HDRS= key_prot.h klm_prot.h mount.h nfs_prot.h nlm_prot.h rex.h rnusers.h \
       rquota.h rstat.h rwall.h sm_inter.h spray.h yppasswd.h yp.h \
diff --git a/share/mk/sys.mk b/share/mk/sys.mk
--- a/share/mk/sys.mk
+++ b/share/mk/sys.mk
@@ -264,6 +264,9 @@
 
 RC		?=	f77
 RFLAGS		?=
+.if !defined(%POSIX)
+RPCGEN		?=	rpcgen
+.endif
 
 TSORT		?=	tsort
 TSORTFLAGS	?=	-q
@@ -283,6 +286,10 @@
 YFLAGS		?=	-d
 .endif
 
+.if !defined(%POSIX)
+ZIC		?=	zic
+.endif
+
 .if defined(%POSIX)
 
 .include "bsd.suffixes-posix.mk"
diff --git a/share/zoneinfo/Makefile b/share/zoneinfo/Makefile
--- a/share/zoneinfo/Makefile
+++ b/share/zoneinfo/Makefile
@@ -86,7 +86,7 @@
 	mkdir -p ${TZBUILDDIR}
 	cd ${TZBUILDDIR}; mkdir -p ${TZBUILDSUBDIRS}
 	umask 022; cd ${.CURDIR}; \
-	zic -D -d ${TZBUILDDIR} ${ZICFLAGS} -m ${NOBINMODE} \
+	${ZIC} -D -d ${TZBUILDDIR} ${ZICFLAGS} -m ${NOBINMODE} \
 	    ${LEAPFILE} ${TZFILES}
 
 #