diff --git a/lib/Makefile.am b/lib/Makefile.am
index cd62d19..f95428f 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -62,6 +62,10 @@
 SUBDIRS += php
 endif
 
+if WITH_D
+SUBDIRS += d
+endif
+
 # All of the libs that don't use Automake need to go in here
 # so they will end up in our release tarballs.
 EXTRA_DIST = \