Change behavior. (require racket-makefile) and use (make <target>) instead of racket Makefile.rkt <target>

examples/Makefile.rkt

@@ -1,5 +1,16 @@
 #lang racket-makefile
 
+;; Load only:
+;;   racket -t Makefile.rkt
+;;
+;; Build the default target:
+;;   racket -t Makefile.rkt -e "(make)"
+;;
+;; Clean and rebuild:
+;;   racket -t Makefile.rkt -e "(make clean all)"
+;;
+;; In DrRacket, press Run and then enter (make), (make clean), etc.
+
 (define CC 'cc)
 (define CFLAGS '(-Wall -O2))
 

examples/generated-targets.rkt

@@ -0,0 +1,22 @@
+#lang racket-makefile
+
+;; Ordinary Racket can generate targets and dependency lists.
+
+(define sources '("foo.c" "bar.c" "baz.c"))
+
+(define objects
+  (for/list ([src sources])
+    (define obj (path-replace-extension src #".o"))
+    (target obj
+      (deps src)
+      (run `(cc -c $< -o $target)))
+    obj))
+
+(default-target all)
+(phony all clean)
+
+(target all
+  (deps objects))
+
+(target clean
+  (apply rm-f objects))