ifndef HAS_UTIL_MK
HAS_UTIL_MK := T

MK_DIR := $(patsubst %/,%,$(dir $(lastword $(MAKEFILE_LIST))))

# define the $(\n) macro which has the value '\n'
# Nonoerrte: This really requires two empty lines!
ifndef \n
define \n


endef
endif

# define the $, or $(,) macro which has the value ','
ifndef ,
  , := ,
endif
ifndef comma
  comma := ,
endif

# define the $(sp) macro which has the value ' '
ifndef blank
  blank :=
endif
ifndef sp
  sp := $(blank) $(blank)
endif

# define the $= or $(=) macro which has the value '='
ifndef equals
  equals := =
endif
ifndef $(equals)
  $(equals) := =
endif

# define the $# or $(#) macro which has the value '#'
ifndef \#
  hash := \#
endif
ifndef $(hash)
  $(hash) := \#
endif

# define the $: or $(:) macro which has the value ':'
ifndef colon
  colon := :
endif
ifndef $(colon)
  $(colon) := :
endif

# define the $($$) macro which has the value '$'
ifndef dollar
  dollar := $$
endif
ifndef $(dollar)
  $(dollar) := $$
endif

#define macros for '(' and ')'
ifndef oparen
  oparen := (
endif
ifndef cparen
  cparen := )
endif

dummy :=
sp := $(dummy) $(dummy)
PARENO := (
PARENC := )

ifneq (,$(or $(ComSpec),$(COMSPEC),$(comspec)))
  ifneq (,$(filter Cygwin,$(shell uname -a)))
    HOSTENV := cygwin
    NULL := /dev/null
    fixpath-shell = $(subst $(sp),\$(sp),$(subst $(oparen),\$(oparen),$(subst $(cparen),\$(cparen),$(subst \,/,$(1)))))
    fixpath-cyg = $(call fixpath-shell,$(1))
    fixpath-make = $(strip\
      $(subst $(sp),?,$(shell cygpath $(call fixpath-cyg,$(1)))))
  else
    HOSTENV := w32
    DIRSEP  := $(strip \)
    NULL := nul
    fixpath-shell = $(subst ?,$(sp),$(subst /,\,$(subst $(sp),?,$(1))))
    fixpath-make = $(subst \,/,$(subst $(sp),?,$(1)))
    MD := mkdir
  endif
else
  FQDN := $(shell hostname -f)
  HOSTNAME := $(shell hostname -s)
  DOMAIN := $(subst $(HOSTNAME).,,$(FQDN))
endif

HOSTENV       ?= unix
DIRSEP        ?= /
SHQ           ?= $(strip \)
fixpath-make  ?= $(1)
fixpath-shell ?= $(1)

TEST := test
RM   ?= rm -f
RD   ?= rm -rf
MD   ?= mkdir -p

NULL ?= $(or $(wildcard /dev/null),nul)

ifeq (T,$(V))
  mk-debug      = $(info $(1))
  mk-debug-lno  = $(warning $(\n)$(1))
  mk-debug-vars = $(foreach _mkv,$(1),$(info $(_mkv) := '$($(_mkv))'))
endif

define include-once-helper
  ifndef $(subst ?,_,$(subst /,_,$(2)))-included
    ifneq (,$(wildcard $(2)))
      $(subst ?,_,$(subst /,_,$(2)))-included := T
      $$(call mk-debug-lno,+ including '$(1)')
      include $(2)
    else
      $$(call mk-debug-lno,[WARN] could not find '$(1)')
    endif
  endif
endef

include-once = $(eval $(call include-once-helper,$1,$(subst $(sp),?,$(1))))

# END: HAS_UTIL_MK
endif


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