build-minor=3
# Required third party libraries
-ECJ_BRANCH=3.33
+ECJ_MAJOR=3
BNDLIB_BRANCH=5.3
SYSLOGGER_BRANCH=$(build-major).$(build-minor)
+
+# GNU defaults
+prefix ?= /usr/local
+datarootdir ?= $(prefix)/share
+exec_prefix ?= $(prefix)
+libdir ?= $(exec_prefix)/lib
+
+A2_INSTALL_TARGET ?= $(DESTDIR)$(datarootdir)/a2
+A2_NATIVE_INSTALL_TARGET ?= $(DESTDIR)$(libdir)/a2
+
+# OS-speciific
+KNOWN_ARCHS ?= x86_64 aarch64
+TARGET_OS ?= linux
+TARGET_ARCH ?= $(shell uname -m)
+
+TARGET_OS_CATEGORY_PREFIX=lib/linux
+TARGET_ARCH_CATEGORY_PREFIX=$(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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