Add the dtrace client app to the build.

cddl/usr.sbin/Makefile

@@ -2,7 +2,8 @@
 
 .include <bsd.own.mk>
 
-SUBDIR=	${_zdb}
+SUBDIR=	dtrace \
+	${_zdb}
 
 .if ${MK_ZFS} != "no"
 .if ${MK_LIBTHR} != "no"

cddl/usr.sbin/dtrace/Makefile

@@ -0,0 +1,37 @@
+# $FreeBSD$
+
+.include	"../../Makefile.inc"
+
+PROG=		dtrace
+
+BINDIR?=	/usr/sbin
+
+SRCS=		dtrace.c
+
+WARNS=		1
+
+CFLAGS+=	-I${.CURDIR}/../../../sys/cddl/compat/opensolaris \
+		-I${.CURDIR}/../../../cddl/compat/opensolaris/include \
+		-I${OPENSOLARIS_USR_DISTDIR}/head \
+		-I${OPENSOLARIS_USR_DISTDIR}/lib/libdtrace/common \
+		-I${OPENSOLARIS_USR_DISTDIR}/lib/libproc/common \
+		-I${OPENSOLARIS_SYS_DISTDIR}/uts/common \
+		-I${OPENSOLARIS_SYS_DISTDIR}/compat
+
+.PATH:		${OPENSOLARIS_USR_DISTDIR}/cmd/dtrace
+
+# Optional debugging stuff...
+#CFLAGS+=	-DNEED_ERRLOC
+#YFLAGS+=	-d
+
+LDFLAGS+=	-pthread \
+		-L${.OBJDIR}/../../lib/libdtrace \
+		-L${.OBJDIR}/../../lib/libproc \
+		-L${.OBJDIR}/../../lib/libctf \
+		-L${.OBJDIR}/../../../lib/libelf
+
+LDADD+=		-ldtrace -ly -ll -lproc -lctf -lelf -lz
+
+DPADD+= ${LIBDTRACE} ${LIBCTF} ${LIBELF} ${LIBPTHREAD} ${LIBL} ${LIBY} ${LIBZ}
+
+.include <bsd.prog.mk>