diff --git a/Rsconscript b/Rsconscript
index b67e9b6..527bdce 100644
--- a/Rsconscript
+++ b/Rsconscript
@@ -1,7 +1,11 @@
-Rscons::Environment.new do |env|
-  env["sources"] = Dir[
-    "src/**/*.d", 
-    "src/**/*.c"]
-  env["D_IMPORT_PATH"] += Dir["src/**/"]
-  env.Program("jes", "${sources}")
+configure do
+  check_d_compiler
+end
+
+build do
+  Rscons::Environment.new do |env|
+    env["sources"] = glob("src/**/*.{c,d}")
+    env["D_IMPORT_PATH"] += glob("src/**")
+    env.Program("jes", "${sources}")
+  end
 end