+SRC_HSC2HS_OPTS += $(addprefix --cflag=,$(filter-out -O,$(SRC_CC_OPTS)))
+
+# Given
+# foo bar
+# make
+# :\"-Ifoo\":\"-Ibar\"
+nothing=
+space=$(nothing) $(nothing)
+SRC_HSC2HS_OPTS += $(subst $(space),,$(foreach d,$(GMP_INCLUDE_DIRS),:\"-I$(d)\"))
+