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	### Remove GNU make implicit rules

	## This speeds things up since we don't need to look for and stat() a
	## "foo.c,v" every time a rule referring to "foo.c" is in play. See
	## "make -p -f/dev/null \| grep ^%::'".
	%:: %,v
	%:: RCS/%,v
	%:: RCS/%
	%:: s.%
	%:: SCCS/s.%

	## Likewise delete default $(SUFFIXES). See:
	##
	## info make --index-search=.SUFFIXES
	.SUFFIXES:

	### Flags affecting all rules

	# A GNU make extension since gmake 3.72 (released in late 1994) to
	# remove the target of rules if commands in those rules fail. The
	# default is to only do that if make itself receives a signal. Affects
	# all targets, see:
	#
	# info make --index-search=.DELETE_ON_ERROR
	.DELETE_ON_ERROR:

	### Global variables

	## comma, empty, space: handy variables as these tokens are either
	## special or can be hard to spot among other Makefile syntax.
	comma := ,
	empty :=
	space := $(empty) $(empty)

	### Quieting
	## common
	QUIET_SUBDIR0 = +$(MAKE) -C # space to separate -C and subdir
	QUIET_SUBDIR1 =

	ifneq ($(findstring w,$(firstword -$(MAKEFLAGS))),w)
	PRINT_DIR = --no-print-directory
	else # "make -w"
	NO_SUBDIR = :
	endif

	ifneq ($(findstring s,$(firstword -$(MAKEFLAGS))),s)
	ifndef V
	## common
	QUIET_SUBDIR0 = +@subdir=
	QUIET_SUBDIR1 = ;$(NO_SUBDIR) echo ' ' SUBDIR $$subdir; \
	$(MAKE) $(PRINT_DIR) -C $$subdir

	QUIET = @
	QUIET_GEN = @echo ' ' GEN $@;

	QUIET_MKDIR_P_PARENT = @echo ' ' MKDIR -p $(@D);

	## Used in "Makefile"
	QUIET_CC = @echo ' ' CC $@;
	QUIET_AR = @echo ' ' AR $@;
	QUIET_LINK = @echo ' ' LINK $@;
	QUIET_BUILT_IN = @echo ' ' BUILTIN $@;
	QUIET_CP = @echo ' ' CP $< $@;
	QUIET_LNCP = @echo ' ' LN/CP $@;
	QUIET_XGETTEXT = @echo ' ' XGETTEXT $@;
	QUIET_MSGINIT = @echo ' ' MSGINIT $@;
	QUIET_MSGFMT = @echo ' ' MSGFMT $@;
	QUIET_MSGMERGE = @echo ' ' MSGMERGE $@;
	QUIET_GCOV = @echo ' ' GCOV $@;
	QUIET_SP = @echo ' ' SP $<;
	QUIET_HDR = @echo ' ' HDR $(<:hcc=h);
	QUIET_RC = @echo ' ' RC $@;

	## Used in "Makefile": SPATCH
	QUIET_SPATCH = @echo ' ' SPATCH $< \>$@;
	QUIET_SPATCH_TEST = @echo ' ' SPATCH TEST $(@:.build/%=%);
	QUIET_SPATCH_CAT = @echo ' ' SPATCH CAT $(@:%.patch=%.d/)\\.patch \>$@;

	## Used in "Documentation/Makefile"
	QUIET_ASCIIDOC = @echo ' ' ASCIIDOC $@;
	QUIET_XMLTO = @echo ' ' XMLTO $@;
	QUIET_DB2TEXI = @echo ' ' DB2TEXI $@;
	QUIET_MAKEINFO = @echo ' ' MAKEINFO $@;
	QUIET_DBLATEX = @echo ' ' DBLATEX $@;
	QUIET_XSLTPROC = @echo ' ' XSLTPROC $@;
	QUIET_GEN = @echo ' ' GEN $@;
	QUIET_STDERR = 2> /dev/null

	QUIET_LINT_GITLINK = @echo ' ' LINT GITLINK $<;
	QUIET_LINT_MANSEC = @echo ' ' LINT MAN SEC $<;
	QUIET_LINT_MANEND = @echo ' ' LINT MAN END $<;

	export V
	endif
	endif

	### Templates

	## mkdir_p_parent: lazily "mkdir -p" the path needed for a $@
	## file. Uses $(wildcard) to avoid the "mkdir -p" if it's not
	## needed.
	##
	## Is racy, but in a good way; we might redundantly (and safely)
	## "mkdir -p" when running in parallel, but won't need to exhaustively create
	## individual rules for "a" -> "prefix" -> "dir" -> "file" if given a
	## "a/prefix/dir/file". This can instead be inserted at the start of
	## the "a/prefix/dir/file" rule.
	define mkdir_p_parent_template
	$(if $(wildcard $(@D)),,$(QUIET_MKDIR_P_PARENT)$(shell mkdir -p $(@D)))
	endef

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