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+====== make ======
+Things worth knowing about ''make'' and ''Makefiles''.
+====== Makefiles ======
+===== Hints =====
+  * a literal '''$''' has to be escaped by doubling it:
+<code make>
+bla:
+        rm $$(echo "-rf /")
+</code>
+  * place a dash ('''-''') in front of a command to have ''make'' ignore it's return value:
+<code make>
+bla:
+        -rm $$(echo "-rf /")
+</code>
+===== $(builtins ) =====
+  * subst
+<code make>
+$(OBJECTS) :
+        javac $(subst .class,.java,$@)
+</code>
+  * filter
+<code make>
+FILES = Bla.java Blub.java Wrong.here
+$(filter %.java,$(FILES)) :
+        javac $@
+$(filter %.here,$(FILES)) :
+        echo "Wrong here?!"
+</code>
+===== Static Patterns =====
+<file>
+targets ...: target-pattern: prereq-patterns ...
+        commands
+</file>
+Sample usage:
+<code make>
+objects = foo.o bar.o
+all: $(objects)
+$(objects): %.o: %.c
+        $(CC) -c $(CFLAGS) $< -o $@
+</code>
+===== Misc Goodies =====
+ * recursing paths:
+<code make>
+PATH=/a/b/c/d/e/f/g/h
+PLIST:=
+define recurse
+ifneq ($(strip $(shell dirname ${1})),/)
+$$(eval $$(call recurse,$(shell dirname ${1})))
+PLIST+= $(shell dirname ${1})
+endif
+endef
+all: $(eval $(call recurse,${PATH}))
+	@for i in ${PLIST}; do echo $$i; done
+</code>
+ * a more advanced version of the above:
+<code make>
+PATH=/a/b/c/d/e/f/g/h
+ifneq (${REVERSE},)
+REVERSE:=true
+endif
+REVERSE?=false
+PLIST:=
+define get_dirname
+$(strip $(shell dirname ${1}))
+endef
+define list_add
+ifneq (${2},${3})
+PLIST += $$(call get_dirname,${1})
+endif
+endef
+define recurse
+DNAME:=$$(call get_dirname,${1})
+ifneq ($${DNAME},/)
+$$(eval $$(call list_add,${1},$${REVERSE},true))
+$$(eval $$(call recurse,$${DNAME}))
+$$(eval $$(call list_add,${1},$${REVERSE},false))
+endif
+endef
+all: $(eval $(call recurse, ${PATH}))
+	@for i in ${PLIST}; do echo $$i; done
+</code>
+====== Links ======
+[[http://www.gnu.org/software/make/manual/html_node/index.html|GNU Make Manual]]