PORTABLE_CATEGORIES=$(filter-out lib/%, $(CATEGORIES))
ARCH_CATEGORIES=$(filter $(TARGET_ARCH_CATEGORY_PREFIX)/%, $(CATEGORIES))
OS_CATEGORIES=$(filter-out $(foreach arch, $(KNOWN_ARCHS), $(TARGET_OS_CATEGORY_PREFIX)/$(arch)/%), $(filter $(TARGET_OS_CATEGORY_PREFIX)/%, $(CATEGORIES)))
+
+# Utilities
+# Make variables used to replace spaces by a separator, typically in order to generate classpaths
+# for example: CLASSPATH = $(subst $(space),$(pathsep),$(strip $(JARS)))
+null :=
+space := $(null) #
+pathsep := :
+define LF
+
+$(null)
+endef