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-rw-r--r--boot/runtime/core.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/boot/runtime/core.c b/boot/runtime/core.c
index c911666..f6c4ef8 100644
--- a/boot/runtime/core.c
+++ b/boot/runtime/core.c
@@ -4,13 +4,16 @@
  * used during bootstrapping, while the full
  * catskill standard library is not yet available.
  *
- * copyright (c) 2025, mel g. <mel@rnrd.eu>
+ * Copyright (c) 2025-2026, Mel G. <mel@rnrd.eu>
  *
- * spdx-license-identifier: mpl-2.0
+ * SPDX-License-Identifier: MPL-2.0
  */
 
 #pragma once
 
+// enable some posix-only functions, like `fileno`.
+#define _POSIX_C_SOURCE 200809L
+
 // common headers for both your average catskill program.
 // other libc headers can be included with the pragma
 // `| c-header "header.h"`.