-JVM := $(JAVA_HOME)/bin/java
-JAVADOC := $(JAVA_HOME)/bin/javadoc
-ECJ_JAR := $(A2_BASE)/org.argeo.tp.sdk/org.eclipse.jdt.core.compiler.batch.3.29.jar
-BNDLIB_JAR := $(A2_BASE)/org.argeo.tp.sdk/biz.aQute.bndlib.5.3.jar
-SLF4J_API_JAR := $(A2_BASE)/org.argeo.tp/org.slf4j.api.1.7.jar
-
-#ARGEO_MAKE = $(JVM) -cp $(ECJ_JAR):$(BNDLIB_JAR):$(SLF4J_API_JAR):$(BUILD_BASE)/bin org/argeo/build/Make
-ARGEO_MAKE := $(JVM) -cp $(ECJ_JAR):$(BNDLIB_JAR):$(SLF4J_API_JAR) $(SDK_SRC_BASE)/sdk/argeo-build/src/org/argeo/build/Make.java
-#BND_TOOL := /usr/bin/bnd
-
+# The following variables are found in the sdk.mk file which is generated by the configure script:
+# SDK_SRC_BASE the base of the source code, typically the root of the cloned git repository
+# SDK_BUILD_BASE the base of the output
+# JAVA_HOME the base of the JDK used to build
+A2_OUTPUT = $(SDK_BUILD_BASE)/a2
+JVM ?= $(JAVA_HOME)/bin/java
+JAVADOC ?= $(JAVA_HOME)/bin/javadoc
+
+# The following variables should be declared in the including Makefile:
+# BUNDLES the space-separated list of bundles to build
+# A2_CATEGORY the (single) a2 category the bundles will belong to
+
+# The following environment variables can change the behaviour of the build
+# SOURCE_BUNDLES sources will be packaged separately in Eclipse-compatible source bundles
+# NO_MANIFEST_COPY generated MANIFESTs won't be copied to the source tree
+
+# The following variables have default values which can be overriden
+# DEP_CATEGORIES the a2 categories the compilation depends on
+# JAVADOC_PACKAGES the space-separated list of packages for which javadoc will be generated
+# A2_BASE the space-separated directories where already built a2 categories can be found
+DEP_CATEGORIES ?=
+JAVADOC_PACKAGES ?=
+A2_BASE ?=/usr/share/a2 /usr/local/share/a2 $(A2_OUTPUT)
+
+# Third-party libraries
+LOGGER_JAR ?= $(lastword $(foreach base, $(A2_BASE), $(wildcard $(base)/log/syslogger/org.argeo.tp/org.argeo.tp.syslogger.$(SYSLOGGER_BRANCH).jar)))
+ECJ_JAR ?= $(lastword $(foreach base, $(A2_BASE), $(wildcard $(base)/org.argeo.tp.build/org.eclipse.jdt.core.compiler.batch.$(ECJ_BRANCH).jar)))
+BNDLIB_JAR ?= $(lastword $(foreach base, $(A2_BASE), $(wildcard $(base)/org.argeo.tp.build/biz.aQute.bndlib.$(BNDLIB_BRANCH).jar)))
+
+# Internal variables
+ARGEO_MAKE = $(JVM) -cp $(LOGGER_JAR):$(ECJ_JAR):$(BNDLIB_JAR) $(ARGEO_BUILD_BASE)src/org/argeo/build/Make.java
+JAVADOC_SRCS = $(foreach bundle, $(BUNDLES), $(bundle)/src)
+ifneq ($(NO_MANIFEST_COPY),true)
+MANIFESTS = $(foreach bundle, $(BUNDLES), $(bundle)/META-INF/MANIFEST.MF)
+endif