diff --git a/lib/rscons.rb b/lib/rscons.rb
index e9cbbf6..7b8afd7 100644
--- a/lib/rscons.rb
+++ b/lib/rscons.rb
@@ -33,6 +33,7 @@ module Rscons
     :Lex,
     :Library,
     :Object,
+    :Precompile,
     :Preprocess,
     :Program,
     :SharedLibrary,
@@ -152,6 +153,7 @@ require_relative "rscons/builders/disassemble"
 require_relative "rscons/builders/lex"
 require_relative "rscons/builders/library"
 require_relative "rscons/builders/object"
+require_relative "rscons/builders/precompile"
 require_relative "rscons/builders/preprocess"
 require_relative "rscons/builders/program"
 require_relative "rscons/builders/shared_library"
diff --git a/lib/rscons/builders/mixins/object_deps.rb b/lib/rscons/builders/mixins/object_deps.rb
index d83a5cc..a96b99b 100644
--- a/lib/rscons/builders/mixins/object_deps.rb
+++ b/lib/rscons/builders/mixins/object_deps.rb
@@ -15,11 +15,16 @@ module Rscons
         #   List of paths to the object or static library dependencies.
         def register_object_deps(builder_class)
           suffixes = @env.expand_varref(["${OBJSUFFIX}", "${LIBSUFFIX}"], @vars)
+          barrier_target = @env.setup_precompile(@sources)
           @sources.map do |source|
             if source.end_with?(*suffixes)
               source
             else
-              @env.register_dependency_build(@target, source, suffixes.first, @vars, builder_class)
+              object_file_path = @env.register_dependency_build(@target, source, suffixes.first, @vars, builder_class)
+              if barrier_target
+                @env.depends(object_file_path, barrier_target)
+              end
+              object_file_path
             end
           end
         end
diff --git a/lib/rscons/builders/precompile.rb b/lib/rscons/builders/precompile.rb
new file mode 100644
index 0000000..d11fe51
--- /dev/null
+++ b/lib/rscons/builders/precompile.rb
@@ -0,0 +1,29 @@
+module Rscons
+  module Builders
+    # The Precompile builder generates .di interface files from .d source files
+    # for D.
+    class Precompile < Builder
+
+      # Run the builder to produce a build target.
+      def run(options)
+        if @command
+          finalize_command
+        else
+          if @sources.find {|s| s.end_with?(*@env.expand_varref("${DSUFFIX}", @vars))}
+            pcc = @env.expand_varref("${DC}")
+            if pcc =~ /ldc/
+              dpc_cmd = "${DPC_CMD:ldc}"
+            else
+              dpc_cmd = "${DPC_CMD:gdc}"
+            end
+            @vars["_TARGET"] = @target
+            @vars["_SOURCES"] = @sources
+            command = @env.build_command(dpc_cmd, @vars)
+            standard_command("Precompile <source>#{Util.short_format_paths(@sources)}<reset>", command)
+          end
+        end
+      end
+
+    end
+  end
+end
diff --git a/lib/rscons/default_construction_variables.rb b/lib/rscons/default_construction_variables.rb
index aa8aa7a..e148df4 100644
--- a/lib/rscons/default_construction_variables.rb
+++ b/lib/rscons/default_construction_variables.rb
@@ -43,6 +43,8 @@ module Rscons
     "DFLAGS" => [],
     "DISASM_CMD" => %w[${OBJDUMP} ${DISASM_FLAGS} ${_SOURCES}],
     "DISASM_FLAGS" => %w[--disassemble --source],
+    "DPC_CMD:ldc" => %w[${DC} -H -Hf ${_TARGET} -o- ${INCPREFIX}${D_IMPORT_PATH} ${DFLAGS} ${_SOURCES}],
+    "DPC_CMD:gdc" => %w[${DC} -H -Hf ${_TARGET} -fsyntax-only ${INCPREFIX}${D_IMPORT_PATH} ${DFLAGS} ${_SOURCES}],
     "DSUFFIX" => %w[.d],
     "D_IMPORT_PATH" => [],
     "INCPREFIX" => "-I",
diff --git a/lib/rscons/environment.rb b/lib/rscons/environment.rb
index ebaaba6..13f73f2 100644
--- a/lib/rscons/environment.rb
+++ b/lib/rscons/environment.rb
@@ -291,6 +291,17 @@ module Rscons
       end
     end
 
+    # Get a path under the build root for precompile outputs.
+    #
+    # @param end_path [String]
+    #   Path to append to precompile build root.
+    #
+    # @return [String]
+    #   Precompile directory name.
+    def get_pc_build_dir(end_path)
+      "#{@build_root}/pc/#{Util.make_relative_path(end_path)}"
+    end
+
     # Build all build targets specified in the Environment.
     #
     # When a block is passed to Environment.new, this method is automatically
@@ -600,6 +611,40 @@ module Rscons
       @builder_sets << build_builder_set
     end
 
+    # Set up builders and barrier for a precompile phase if needed.
+    #
+    # @param sources [Array<String>]
+    #   Sources for the build operation.
+    #
+    # @return [Symbol, nil]
+    #   Barrier target name if a precompile phase is needed, otherwise nil.
+    def setup_precompile(sources)
+      barrier_target = nil
+      precompile_paths = Set.new
+      sources.each do |source|
+        next unless source.end_with?(".d")
+        unless barrier_target
+          barrier_target = Rscons.gen_phony_target
+          self.Barrier(barrier_target)
+        end
+        next unless module_name = Util.get_module_name(source)
+        next unless import_path = Util.find_import_path_for_d_source(self["D_IMPORT_PATH"], source, module_name)
+        precompile_path = get_pc_build_dir(import_path)
+        unless precompile_paths.include?(precompile_path)
+          Util.clean_d_precompile_path(precompile_path, import_path)
+          precompile_paths << precompile_path
+        end
+        unless self["D_IMPORT_PATH"].include?(precompile_path)
+          # Put the precompile path containing the .di files for the given
+          # import path immediately before the import path.
+          index = self["D_IMPORT_PATH"].find_index {|ip| ip == import_path}
+          self["D_IMPORT_PATH"].insert(index, precompile_path)
+        end
+        self.Precompile("#{precompile_path}/#{module_name.gsub(".", "/")}.di", source)
+      end
+      barrier_target
+    end
+
     private
 
     # Build a BuilderSet.
diff --git a/lib/rscons/script.rb b/lib/rscons/script.rb
index 55ee043..a48752d 100644
--- a/lib/rscons/script.rb
+++ b/lib/rscons/script.rb
@@ -34,15 +34,7 @@ module Rscons
       #
       # @return [Array<String>] Paths matching the specified pattern(s).
       def glob(*patterns)
-        require "pathname"
-        patterns.reduce([]) do |result, pattern|
-          if pattern.end_with?("/**")
-            pattern += "/"
-          end
-          result += Dir.glob(pattern).map do |path|
-            Pathname.new(path.gsub("\\", "/")).cleanpath.to_s
-          end
-        end.sort
+        Util.glob(*patterns)
       end
 
       # Download a file.
diff --git a/lib/rscons/util.rb b/lib/rscons/util.rb
index c199e1c..8bd41fb 100644
--- a/lib/rscons/util.rb
+++ b/lib/rscons/util.rb
@@ -16,6 +16,25 @@ module Rscons
         end
       end
 
+      # Remove any stale .di files from the precompile path.
+      #
+      # @param pc_path [String]
+      #   Path to precompile build directory containing .di generated
+      #   interface files.
+      # @param import_path [String]
+      #   D import path containing .d source files.
+      #
+      # @return [void]
+      def clean_d_precompile_path(pc_path, import_path)
+        glob("#{pc_path}/**/*.di").each do |di_path|
+          end_path = di_path[(pc_path.size+1)..]
+          path = "#{import_path}/#{end_path}".sub(/\.di$/, ".d")
+          unless File.exist?(path)
+            FileUtils.rm_f(path)
+          end
+        end
+      end
+
       # Colorize a builder run message.
       #
       # @param message [String]
@@ -120,6 +139,29 @@ module Rscons
         end
       end
 
+      # Find the D import path that will be used to import the given module.
+      #
+      # @param import_paths [Array<String>]
+      #   Import paths.
+      # @param source [String]
+      #   Source file name.
+      # @param module_name [String]
+      #   Module name.
+      #
+      # @return [String, nil]
+      #   Import path used to import the given module.
+      def find_import_path_for_d_source(import_paths, source, module_name)
+        source = source.gsub("\\", "/")
+        module_path = module_name.gsub(".", "/") + ".d"
+        import_paths.each do |import_path|
+          path = "#{import_path}/#{module_path}".gsub("\\", "/")
+          if path == source
+            return import_path
+          end
+        end
+        nil
+      end
+
       # Format an elapsed time in human-readable format.
       #
       # @return [String]
@@ -141,6 +183,52 @@ module Rscons
         result
       end
 
+      # Get the module name for a D source file.
+      #
+      # @param source_path [String]
+      #   D source file.
+      #
+      # @return [String, nil]
+      #   Module name.
+      def get_module_name(source_path)
+        if File.exist?(source_path)
+          if File.binread(source_path) =~ /^\s*module\s(\S*);/
+            return $1
+          end
+          name = File.basename(source_path).sub(/\.d$/, "")
+          if name =~ /^\w+$/
+            return name
+          end
+        end
+      end
+
+      # Return a list of paths matching the specified pattern(s).
+      #
+      # A pattern can contain a "/**" component to recurse through directories.
+      # If the pattern ends with "/**" then only the recursive list of
+      # directories will be returned.
+      #
+      # Examples:
+      # - "src/**": return all directories under "src", recursively (including
+      #   "src" itself).
+      # - "src/**/*": return all files and directories recursively under the src
+      #   directory.
+      # - "src/**/*.c": return all .c files recursively under the src directory.
+      # - "dir/*/": return all directories in dir, but no files.
+      #
+      # @return [Array<String>] Paths matching the specified pattern(s).
+      def glob(*patterns)
+        require "pathname"
+        patterns.reduce([]) do |result, pattern|
+          if pattern.end_with?("/**")
+            pattern += "/"
+          end
+          result += Dir.glob(pattern).map do |path|
+            Pathname.new(path.gsub("\\", "/")).cleanpath.to_s
+          end
+        end.sort
+      end
+
       # Make a relative path corresponding to a possibly absolute one.
       #
       # @param path [String]