diff --git a/pyconfig.h.in b/pyconfig.h.in
index c169797..e2dd4d2 100644
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -342,6 +342,9 @@
 /* Define to 1 if you have the `readlink' function. */
 #undef HAVE_READLINK
 
+/* Define to 1 if you have the `realpath' function. */
+#undef HAVE_REALPATH
+
 /* Define if you have readline 2.2 */
 #undef HAVE_RL_COMPLETION_APPEND_CHARACTER