[Positioning] Makefile: add help

owlps-positioning/Makefile

@@ -294,3 +294,29 @@ check:
 	@$(CPPCHECK) \
 		$(SOURCE) \
 		$(TARGET).cc
+
+help:
+	@echo -e "Needed libraries:\n\
+		libboost-dev\n\
+		libboost-program-options-dev\n\
+	\n\
+	Optional programs nedded for specific targets:\n\
+		doxygen\n\
+		CxxTest suite\n\
+		astyle (Artistic Style)\n\
+		cppcheck\n\
+	\n\
+	Targets:\n\
+		all (default target): Compiles OwlPS Positioning.\n\
+		doc: Generates documentation from source files (doxygen is required).\n\
+		install: Installs OwlPS Positioning.\n\
+		uninstall: Uninstalls OwlPS Positioning.\n\
+	\n\
+		test: Run unit tests (CxxTest suite is required).\n\
+		style: Reindent source files (astyle is required).\n\
+		check: Run automated checs on the source code (cppcheck is required).\n\
+	\n\
+		clean: Delete temporary files.\n\
+		purge: Delete all generated files.\n\
+	\n\
+	Note: Files are installed under /usr/local. Tune the PREFIX variable in the Makefile to change that."