ifeq (,$(filter --no-print-directory,$(MAKEFLAGS)))
  MAKEFLAGS +=--no-print-directory
endif

define flush_vars=
$(foreach _____v,$(1),$(eval unexport $(_____v)))
$(foreach _____v,$(1),$(eval override undefine $(_____v)))
endef

$(call flush_vars, LANGUAGE LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE )
$(call flush_vars, LC_MONETARY LC_MESSAGES LC_PAPER LC_NAME LC_ADDRESS )
$(call flush_vars, LC_TELEPHONE LC_MEASUREMENT LC_IDENTIFICATION )
$(call flush_vars, GREP_OPTIONS POSIXLY_CORRECT )

export LC_ALL :=C.UTF-8
export LANG   :=C.UTF-8

SHELL :=sh -e

BUILD_DIR = debian/build
STAMPS_DIR = debian/stamps