)
endef
+# TODO: push this into the combo files; unfortunately, we don't even
+# know HOST_OS at this point.
+trysed := $(shell echo a | sed -E -e 's/a/b/' 2>/dev/null)
+ifeq ($(trysed),b)
+ SED_EXTENDED := sed -E
+else
+ trysed := $(shell echo c | sed -r -e 's/c/d/' 2>/dev/null)
+ ifeq ($(trysed),d)
+ SED_EXTENDED := sed -r
+ else
+ $(error Unknown sed version)
+ endif
+endif
+
###########################################################
## List all of the files in a subdirectory in a format
## suitable for PRODUCT_COPY_FILES and
###########################################################
define find-copy-subdir-files
-$(shell find $(2) -name "$(1)" | sed -E "s:($(2)/?(.*)):\\1\\:$(3)/\\2:" | sed "s://:/:g")
+$(shell find $(2) -name "$(1)" | $(SED_EXTENDED) "s:($(2)/?(.*)):\\1\\:$(3)/\\2:" | sed "s://:/:g")
endef
# ---------------------------------------------------------------