Split Makefile.lib into several *.mk files

mk/install.mk

@@ -0,0 +1,23 @@
+# Add a rule for creating $(1) as a directory.  This template may be
+# called multiple times for the same directory.
+define create-dir =
+  ifndef $(1)_SEEN
+    $(1)_SEEN = 1
+    $(1):
+	install -d $(1)
+  endif
+endef
+
+
+# Add a rule for installing file $(2) in directory $(1).  The
+# directory will be created automatically.
+define install-file-in =
+
+  install:: $(1)/$(notdir $(2))
+
+  $$(eval $$(call create-dir,$(1)))
+
+  $(1)/$(notdir $(2)): $(2) | $(1)
+	install -t $(1) $(2)
+
+endef