diff --git a/include/ircd/portable.h b/include/ircd/portable.h
index 1e13093a4..1a076b19d 100644
--- a/include/ircd/portable.h
+++ b/include/ircd/portable.h
@@ -14,6 +14,14 @@
 
 #define HAVE_IRCD_PORTABLE_H
 
+//
+// For non-clang
+//
+
+#ifndef __has_builtin
+	#define __has_builtin(x) 0
+#endif
+
 //
 // Common branch prediction macros
 //