diff --git a/configure.ac b/configure.ac
index 53ada3a..bc52adf 100755
--- a/configure.ac
+++ b/configure.ac
@@ -781,6 +781,8 @@
 AC_SUBST([MAYBE_CPP])
 if test "$have_c_glib" = "yes" ; then MAYBE_C_GLIB="c_glib" ; else MAYBE_C_GLIB="" ; fi
 AC_SUBST([MAYBE_C_GLIB])
+if test "$have_d" = "yes" -a "$have_deimos_event2" = "yes" -a "$have_deimos_openssl" = "yes"; then MAYBE_D="d" ; else MAYBE_D="" ; fi
+AC_SUBST([MAYBE_D])
 if test "$have_java" = "yes" ; then MAYBE_JAVA="java" ; else MAYBE_JAVA="" ; fi
 AC_SUBST([MAYBE_JAVA])
 if test "$have_csharp" = "yes" ; then MAYBE_CSHARP="csharp" ; else MAYBE_CSHARP="" ; fi