invoke the builder's run() method

lib/rscons/builders/cc.rb

@@ -6,5 +6,8 @@ module Rscons
       'CPPFLAGS' => [],
       'OBJSUFFIX' => '.o',
     }
+
+    def run(env, sources)
+    end
   end
 end

lib/rscons/builders/program.rb

@@ -7,5 +7,8 @@ module Rscons
       'LDFLAGS' => [],
       'LIBS' => [],
     }
+
+    def run(env, sources)
+    end
   end
 end

lib/rscons/environment.rb

@@ -21,6 +21,7 @@ module Rscons
     end
 
     def add_builder(builder_class)
+      @builders[builder_class.to_s.split(':').last] = builder_class
       var_defs = builder_class.const_get('VARIABLE_DEFAULTS')
       if var_defs
         var_defs.each_pair do |var, val|
@@ -45,6 +46,9 @@ module Rscons
 
     def method_missing(method, *args)
       if @builders.has_key?(method.to_s)
+        # TODO: build sources if necessary
+        builder = @builders[method.to_s].new
+        builder.run(self, args.first)
       end
     end
   end