# GNU defaults
prefix ?= /usr/local
datarootdir ?= $(prefix)/share
+libdir ?= $(exec_prefix)/lib
-A2_INSTALL_TARGET ?= $(DESTDIR)$(datarootdir)/a2
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+A2_INSTALL_TARGET ?= $(DESTDIR)$(datarootdir)/a2
+A2_NATIVE_INSTALL_TARGET ?= $(DESTDIR)$(libdir)/a2
+
+# OS-speciific
+OS_CATEGORY_PREFIX=lib/linux
+ARCH_CATEGORY_PREFIX=$(OS_CATEGORY_PREFIX)/$(shell uname -m)
+
+PORTABLE_CATEGORIES=$(filter-out $(OS_CATEGORY_PREFIX)/%, $(CATEGORIES))
+ARCH_CATEGORIES=$(filter $(ARCH_CATEGORY_PREFIX)/%, $(CATEGORIES))
+OS_CATEGORIES=$(filter-out $(ARCH_CATEGORY_PREFIX)/%, $(filter $(OS_CATEGORY_PREFIX)/%, $(CATEGORIES)))
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