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Merge 1.264 and 1.20 from FreeBSD's bsd.port.mk and bsd.port.subdir.mk respectively

#	from: @(#)bsd.subdir.mk	5.9 (Berkeley) 2/1/91
#	$OpenBSD: bsd.port.subdir.mk,v 1.3 1997/09/09 15:11:29 imp Exp $
#	FreeBSD Id: bsd.port.subdir.mk,v 1.20 1997/08/22 11:16:15 asami Exp
#
# The include file <bsd.port.subdir.mk> contains the default targets
# for building ports subdirectories. 
#
#
# +++ variables +++
#
# STRIP		The flag passed to the install program to cause the binary
#		to be stripped.  This is to be used when building your
#		own install script so that the entire system can be made
#		stripped/not-stripped using a single knob. [-s]
#
# ECHO_MSG	Used to print all the '===>' style prompts - override this
#		to turn them off [echo].
#
# OPSYS		Get the operating system type [`uname -s`]
#
# SUBDIR	A list of subdirectories that should be built as well.
#		Each of the targets will execute the same target in the
#		subdirectories.
#
#
# +++ targets +++
#
#	README.html:
#		Creating README.html for package.
#
#	afterinstall, all, beforeinstall, build, checksum, clean,
#	configure, depend, describe, extract, fetch, fetch-list,
#	install, package, readmes, realinstall, reinstall, tags
#


.MAIN: all

.if !defined(DEBUG_FLAGS)
STRIP?=	-s
.endif

.if !defined(OPSYS)	# XXX !!
OPSYS!=	uname -s
.endif

ECHO_MSG?=	echo

_SUBDIRUSE: .USE
	@for entry in ${SUBDIR}; do \
		OK=""; \
		for dud in $$DUDS; do \
			if [ $${dud} = $${entry} ]; then \
				OK="false"; \
				${ECHO_MSG} "===> ${DIRPRFX}$${entry} skipped"; \
			fi; \
		done; \
		if test -d ${.CURDIR}/$${entry}.${MACHINE}; then \
			edir=$${entry}.${MACHINE}; \
		elif test -d ${.CURDIR}/$${entry}; then \
			edir=$${entry}; \
		else \
			OK="false"; \
			${ECHO_MSG} "===> ${DIRPRFX}$${entry} non-existent"; \
		fi; \
		if [ "$$OK" = "" ]; then \
			${ECHO_MSG} "===> ${DIRPRFX}$${edir}"; \
			cd ${.CURDIR}/$${edir}; \
			${MAKE} ${.TARGET:realinstall=install} \
				DIRPRFX=${DIRPRFX}$$edir/; \
		fi; \
	done

${SUBDIR}::
	@if test -d ${.TARGET}.${MACHINE}; then \
		cd ${.CURDIR}/${.TARGET}.${MACHINE}; \
	else \
		cd ${.CURDIR}/${.TARGET}; \
	fi; \
	${MAKE} all

.for __target in all fetch fetch-list package extract configure \
		 build clean depend describe distclean reinstall tags checksum
.if !target(__target)
${__target}: _SUBDIRUSE
.endif
.endfor

.if !target(install)
.if !target(beforeinstall)
beforeinstall:
.endif
.if !target(afterinstall)
afterinstall:
.endif
install: afterinstall
afterinstall: realinstall
realinstall: beforeinstall _SUBDIRUSE
.endif

.if !target(readmes)
readmes: readme _SUBDIRUSE
.endif

.if !target(readme)
readme:
	@rm -f README.html
	@make README.html
.endif

.if (${OPSYS} == "NetBSD")
PORTSDIR ?= /usr/opt
.else
PORTSDIR ?= /usr/ports
.endif
TEMPLATES ?= ${PORTSDIR}/templates
.if defined(PORTSTOP)
README=	${TEMPLATES}/README.top
.else
README=	${TEMPLATES}/README.category
.endif

README.html:
	@echo "===>  Creating README.html"
	@> $@.tmp
.for entry in ${SUBDIR}
.if defined(PORTSTOP)
	@echo -n '<a href="'${entry}/README.html'">${entry}</a>: ' >> $@.tmp
.else
	@echo -n '<a href="'${entry}/README.html'">'"`cd ${entry}; make package-name`</a>: " >> $@.tmp
.endif
.if exists(${entry}/pkg/COMMENT)
	@cat ${entry}/pkg/COMMENT >> $@.tmp
.else
	@echo "(no description)" >> $@.tmp
.endif
.endfor
	@sort -t '>' +1 -2 $@.tmp > $@.tmp2
	@cat ${README} | \
		sed -e 's
%%CATEGORY%%
'`echo ${.CURDIR} | sed -e 's.*/\([^/]*\)$$\1'`'
g' \
			-e '/%%DESCR%%/r${.CURDIR}/pkg/DESCR' \
			-e '/%%DESCR%%/d' \
			-e '/%%SUBDIR%%/r$@.tmp2' \
			-e '/%%SUBDIR%%/d' \
		> $@
	@rm -f $@.tmp $@.tmp2