diff --git a/lib/rscons.rb b/lib/rscons.rb
index 79da761..2047c38 100644
--- a/lib/rscons.rb
+++ b/lib/rscons.rb
@@ -1,5 +1,14 @@
 require "rscons/version"
+require "rscons/builder"
+require "rscons/environment"
+
+# default builders
+require "rscons/builders/cc"
+require "rscons/builders/program"
 
 module Rscons
-  # Your code goes here...
+  DEFAULT_BUILDERS = [
+    CC,
+    Program
+  ]
 end
diff --git a/lib/rscons/builder.rb b/lib/rscons/builder.rb
new file mode 100644
index 0000000..38c3ba7
--- /dev/null
+++ b/lib/rscons/builder.rb
@@ -0,0 +1,4 @@
+module Rscons
+  class Builder
+  end
+end
diff --git a/lib/rscons/builders/cc.rb b/lib/rscons/builders/cc.rb
new file mode 100644
index 0000000..dd062c0
--- /dev/null
+++ b/lib/rscons/builders/cc.rb
@@ -0,0 +1,10 @@
+module Rscons
+  class CC < Builder
+    VARIABLE_DEFAULTS = {
+      'CC' => 'gcc',
+      'CFLAGS' => [],
+      'CPPFLAGS' => [],
+      'OBJSUFFIX' => '.o',
+    }
+  end
+end
diff --git a/lib/rscons/builders/program.rb b/lib/rscons/builders/program.rb
new file mode 100644
index 0000000..8b48f4c
--- /dev/null
+++ b/lib/rscons/builders/program.rb
@@ -0,0 +1,11 @@
+module Rscons
+  class Program < Builder
+    VARIABLE_DEFAULTS = {
+      'LD' => nil,
+      'OBJSUFFIX' => '.o',
+      'LIBSUFFIX' => '.a',
+      'LDFLAGS' => [],
+      'LIBS' => [],
+    }
+  end
+end
diff --git a/lib/rscons/environment.rb b/lib/rscons/environment.rb
new file mode 100644
index 0000000..63fb745
--- /dev/null
+++ b/lib/rscons/environment.rb
@@ -0,0 +1,51 @@
+module Rscons
+  class Environment
+    # Values:
+    #  :none - do not print anything
+    #  :short - rscons will print a short representation of the step
+    #           being performed
+    #  :command (default) - print the full command being executed
+    attr_accessor :echo
+
+    def initialize(options = {})
+      @echo = :command
+      @variables = options.reject { |key, val| not key[0] =~ /[A-Z]/ }
+      @builders = {}
+      @build_dirs = {}
+      unless @variables[:omit_default_builders]
+        DEFAULT_BUILDERS.each do |builder_class|
+          add_builder(builder_class)
+        end
+      end
+      @echo = options[:echo] if options[:echo]
+    end
+
+    def add_builder(builder_class)
+      var_defs = builder_class.const_get('VARIABLE_DEFAULTS')
+      if var_defs
+        var_defs.each_pair do |var, val|
+          unless @variables.has_key?(var)
+            @variables[var] = val
+          end
+        end
+      end
+    end
+
+    def [](key)
+      @variables[key]
+    end
+
+    def []=(key, val)
+      @variables[key] = val
+    end
+
+    def build_dir(src_dir, build_dir)
+      @build_dirs[src_dir] = build_dir
+    end
+
+    def method_missing(method, *args)
+      if @builders.has_key?(method.to_s)
+      end
+    end
+  end
+end