diff --git a/acconfig.h b/acconfig.h
index 48027d63bf8724d424baa1b8c9016ddd804f40c0..c568b0ee3dc7d8469c1e71fea54d6230afc2f7f1 100644
--- a/acconfig.h
+++ b/acconfig.h
@@ -60,6 +60,9 @@
 /* Define if you have the WinExec function.  */
 #define HAVE_WINEXEC 0
 
+/* Define if you support the production (and use) of Win32 DLLs. */
+#undef HAVE_WIN32_DLL_SUPPORT
+
 /* Define if C Symbols have a leading underscore added by the compiler */
 #undef LEADING_UNDERSCORE
 
diff --git a/mk/config.h.in b/mk/config.h.in
index 834bcea24e6e9fa309006eb5f74db912a1bfc6e9..5a2d8fc532cca233676d76050b05f01fb66aab1d 100644
--- a/mk/config.h.in
+++ b/mk/config.h.in
@@ -111,6 +111,9 @@
 /* Define if you have the WinExec function.  */
 #define HAVE_WINEXEC 0
 
+/* Define if you support the production (and use) of Win32 DLLs. */
+#undef HAVE_WIN32_DLL_SUPPORT
+
 /* Define if C Symbols have a leading underscore added by the compiler */
 #undef LEADING_UNDERSCORE