diff --git a/build_tests/custom_builder/build.rb b/build_tests/custom_builder/build.rb
index 20c9bfd..3b7bebc 100644
--- a/build_tests/custom_builder/build.rb
+++ b/build_tests/custom_builder/build.rb
@@ -1,5 +1,5 @@
 class MySource < Rscons::Builder
-  def run(target, sources, cache)
+  def run(target, sources, cache, env)
     File.open(target, 'w') do |fh|
       fh.puts <<EOF
 #define THE_VALUE 5678
@@ -10,7 +10,7 @@ EOF
 end
 
 Rscons::Environment.new(echo: :short) do |env|
-  env.add_builder(MySource.new(env))
+  env.add_builder(MySource.new)
   env.MySource('inc.h', [])
   env.Program('program', Dir['*.c'])
 end
diff --git a/lib/rscons/builder.rb b/lib/rscons/builder.rb
index 04a0043..99f0305 100644
--- a/lib/rscons/builder.rb
+++ b/lib/rscons/builder.rb
@@ -1,12 +1,9 @@
 module Rscons
   class Builder
-    def initialize(env)
-      @env = env
-    end
     def default_variables(env)
       {}
     end
-    def produces?(target, source)
+    def produces?(target, source, env)
       false
     end
   end
diff --git a/lib/rscons/builders/cc.rb b/lib/rscons/builders/cc.rb
index d46082d..87f746f 100644
--- a/lib/rscons/builders/cc.rb
+++ b/lib/rscons/builders/cc.rb
@@ -13,22 +13,22 @@ module Rscons
       }
     end
 
-    def produces?(target, source)
-      target.has_suffix?(@env['OBJSUFFIX']) and source.has_suffix?(@env['CSUFFIX'])
+    def produces?(target, source, env)
+      target.has_suffix?(env['OBJSUFFIX']) and source.has_suffix?(env['CSUFFIX'])
     end
 
-    def run(target, sources, cache)
+    def run(target, sources, cache, env)
       vars = {
         'TARGET' => target,
         'SOURCES' => sources,
         'DEPFILE' => target.set_suffix('.mf'),
       }
-      command = @env.build_command(@env['CCCOM'], vars)
+      command = env.build_command(env['CCCOM'], vars)
       unless cache.up_to_date?(target, command, sources)
-        return false unless @env.execute("CC #{target}", command)
+        return false unless env.execute("CC #{target}", command)
         deps = sources
         if File.exists?(vars['DEPFILE'])
-          deps += @env.parse_makefile_deps(vars['DEPFILE'], target)
+          deps += env.parse_makefile_deps(vars['DEPFILE'], target)
           FileUtils.rm_f(vars['DEPFILE'])
         end
         cache.register_build(target, command, deps.uniq)
diff --git a/lib/rscons/builders/program.rb b/lib/rscons/builders/program.rb
index c0d1437..ff1f084 100644
--- a/lib/rscons/builders/program.rb
+++ b/lib/rscons/builders/program.rb
@@ -12,27 +12,27 @@ module Rscons
       }
     end
 
-    def run(target, sources, cache)
+    def run(target, sources, cache, env)
       # convert sources to object file names
       sources = sources.map do |source|
-        if source.has_suffix?([@env['OBJSUFFIX'], @env['LIBSUFFIX']])
+        if source.has_suffix?([env['OBJSUFFIX'], env['LIBSUFFIX']])
           source
         else
-          o_file = @env.get_build_fname(source, @env['OBJSUFFIX', :string])
-          builder = @env.builders.values.find { |b| b.produces?(o_file, source) }
+          o_file = env.get_build_fname(source, env['OBJSUFFIX', :string])
+          builder = env.builders.values.find { |b| b.produces?(o_file, source, env) }
           builder or raise "No builder found to convert input source #{source.inspect} to an object file."
-          builder.run(o_file, [source], cache) or break
+          builder.run(o_file, [source], cache, env) or break
         end
       end
       if sources
         vars = {
           'TARGET' => target,
           'SOURCES' => sources,
-          'LD' => @env['LD'] || @env['CC'], # TODO: figure out whether to use CC or CXX
+          'LD' => env['LD'] || env['CC'], # TODO: figure out whether to use CC or CXX
         }
-        command = @env.build_command(@env['LDCOM'], vars)
+        command = env.build_command(env['LDCOM'], vars)
         unless cache.up_to_date?(target, command, sources)
-          return false unless @env.execute("LD #{target}", command)
+          return false unless env.execute("LD #{target}", command)
           cache.register_build(target, command, sources)
         end
         target
diff --git a/lib/rscons/environment.rb b/lib/rscons/environment.rb
index 353ef49..1f1e3f2 100644
--- a/lib/rscons/environment.rb
+++ b/lib/rscons/environment.rb
@@ -21,7 +21,7 @@ module Rscons
         exclude_builders = Set.new(@varset[:exclude_builders] || [])
         DEFAULT_BUILDERS.each do |builder_class|
           unless exclude_builders.include?(builder_class.short_name)
-            add_builder(builder_class.new(self))
+            add_builder(builder_class.new)
           end
         end
       end
@@ -81,6 +81,7 @@ module Rscons
           @targets[target][:builder].run(target,
                                          @targets[target][:source],
                                          cache,
+                                         self,
                                          *@targets[target][:args])
         else
           false