diff --git a/config.h.in b/config.h.in
index 7b0bb1aab..a06531e00 100644
--- a/config.h.in
+++ b/config.h.in
@@ -183,3 +183,6 @@
 
 /* Define if you have the m library (-lm).  */
 #undef HAVE_LIBM
+
+/* Define if you have the socket library (-lsocket).  */
+#undef HAVE_LIBSOCKET