A2_NATIVE_INSTALL_TARGET ?= $(DESTDIR)$(libdir)/a2
# OS-speciific
-OS_CATEGORY_PREFIX=lib/linux
-ARCH_CATEGORY_PREFIX=$(OS_CATEGORY_PREFIX)/$(shell uname -m)
+KNOWN_ARCHS ?= x86_64 aarch64
+TARGET_OS ?= linux
+TARGET_ARCH ?= $(shell uname -m)
-PORTABLE_CATEGORIES=$(filter-out $(OS_CATEGORY_PREFIX)/%, $(CATEGORIES))
-ARCH_CATEGORIES=$(filter $(ARCH_CATEGORY_PREFIX)/%, $(CATEGORIES))
-OS_CATEGORIES=$(filter-out $(ARCH_CATEGORY_PREFIX)/%, $(filter $(OS_CATEGORY_PREFIX)/%, $(CATEGORIES)))
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+TARGET_OS_CATEGORY_PREFIX=lib/linux
+TARGET_ARCH_CATEGORY_PREFIX=$(TARGET_OS_CATEGORY_PREFIX)/$(TARGET_ARCH)
+PORTABLE_CATEGORIES=$(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)))
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