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diff --git a/share/mk/bsd.dtrace.mk b/share/mk/bsd.dtrace.mk
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+# $FreeBSD$
+#
+# Copyright (c) 2010 The FreeBSD Foundation
+# All rights reserved.
+#
+# This software was developed by Rui Paulo under sponsorship from the
+# FreeBSD Foundation.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in the
+# documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+#
+#
+# The only variable that you should define on your Makefile is 'DTRACEOBJS'.
+#
+
+.if defined(WITH_DTRACE)
+
+CFLAGS+=-DWITH_DTRACE
+DTRACEHEADERS=${DTRACEOBJS:S/o$/h/}
+DTRACESRCS=${DTRACEOBJS:S/o$/d/}
+CLEANFILES+=${DTRACEOBJS} ${DTRACEHEADERS}
+.if defined(PROG)
+_DTRACELINKING:=${OBJS}
+OBJS+=${DTRACEOBJS}
+.else
+_DTRACELINKING:=${SOBJS}
+SOBJS+=${DTRACEOBJS}
+.endif
+DPADD+=${LIBELF}
+LDADD+=-lelf
+
+beforedepend:
+ ${DTRACE} -C -h -s ${DTRACESRCS}
+beforelinking:
+ ${DTRACE} -G -s ${DTRACESRCS} ${_DTRACELINKING}
+
+.endif