define build-dependencies # args: $1 = dir, $2 = distdir

ifeq "$$($1_$2_ghc_ge_609)" "YES"
$1_$2_MKDEPENDHS_FLAGS = -include-pkg-deps -dep-makefile $$($1_$2_depfile) $$(foreach way,$$(filter-out v,$$($1_$2_WAYS)),-dep-suffix $$(way))
else
$1_$2_MKDEPENDHS_FLAGS = -optdep--include-pkg-deps -optdep-f -optdep$$($1_$2_depfile) $$(foreach way,$$(filter-out v,$$($1_$2_WAYS)),-optdep-s -optdep$$(way))
endif

ifneq "$$($1_$2_NO_BUILD_DEPS)" "YES"

$$($1_$2_depfile) : $$(MKDIRHIER) $$(MKDEPENDC) $$($1_$2_HS_SRCS) $$($1_$2_HS_BOOT_SRCS) $$($1_$2_HC_MK_DEPEND_DEP) $$($1_$2_C_FILES) $$($1_$2_S_FILES)
	$$(MKDIRHIER) $1/$2/build
	$(RM) $$@ $$@.tmp
	touch $$@.tmp
ifneq "$$($1_$2_C_SRCS)$$($1_$2_S_SRCS)" ""
	$$(MKDEPENDC) -f $$($1_$2_depfile).tmp $$($1_MKDEPENDC_OPTS) $$(foreach way,$$($1_WAYS),-s $$(way)) -- $$($1_$2_v_ALL_CC_OPTS) -- $$($1_$2_C_FILES) $$($1_$2_S_FILES) || ( $$(RM) $$@; exit 1 )
	sed -e "s|$1/\([^ :]*o[ :]\)|$1/$2/build/\1|g" -e "s|$(TOP)/||" <$$($1_$2_depfile).tmp >$$($1_$2_depfile)
endif
ifneq "$$($1_$2_HS_SRCS)" ""
	$$($1_$2_HC_MK_DEPEND) -M $$($1_$2_MKDEPENDHS_FLAGS) \
	    $$(filter-out -split-objs, $$($1_$2_v_ALL_HC_OPTS)) \
	    $$($1_$2_HS_SRCS) || ( $$(RM) $$@; exit 1 )
endif
	echo "$1_$2_depfile_EXISTS = YES" >> $$@
ifneq "$$($1_$2_SLASH_MODS)" ""
	for dir in $$(sort $$(foreach mod,$$($1_$2_SLASH_MODS),$1/$2/build/$$(dir $$(mod)))); do \
		if test ! -d $$$$dir; then mkdir -p $$$$dir; fi \
	done
endif

endif # $1_$2_NO_BUILD_DEPS

# Note sed magic above: mkdependC can't do -odir stuff, so we have to
# munge the dependencies it generates to refer to the correct targets.

# Seems as good a place as any to attach the unlit dependency
$$($1_$2_depfile) : $$(UNLIT)

ifneq "$$(NO_INCLUDE_DEPS)" "YES"
include $$($1_$2_depfile)
else
ifeq "$$(DEBUG)" "YES"
$$(warning not building dependencies in $1)
endif
endif

endef