add a Rakefile to build with rscons

Rakefile.rb

@@ -0,0 +1,24 @@
+require "rscons"
+
+task :default do
+  Rscons::Environment.new do |env|
+    env.build_root = "build"
+
+    lexer_source = "#{env.build_root}/lex.yy.cc"
+    env.CFile(lexer_source, "parser/parser.ll")
+
+    parser_source = "#{env.build_root}/parser.tab.cc"
+    env.CFile(parser_source, "parser/parser.yy")
+
+    sources = Dir["{util,shapes,main,distrib,parser}/**/*.cc"]
+    sources << lexer_source
+    sources << parser_source
+
+    env["CXXFLAGS"] += ["-Wall", "-O2"]
+    env["CPPPATH"] += Dir["{util,shapes,main,distrib,parser}/**/"]
+    env["CPPPATH"] << "."
+    env["LIBS"] += ["fl", "pthread", "freeimage"]
+
+    env.Program("fart", sources)
+  end
+end