1 files changed, 10 insertions, 0 deletions
diff --git a/kernel/kernel.c b/kernel/kernel.c
index fe9ffa9..128f5dd 100644
--- a/kernel/kernel.c
+++ b/kernel/kernel.c
@@ -1,3 +1,13 @@
+/*
+ * in freestanding mode we can just use this c lib headers
+ * stdbool,sddef,stdint, 
+ * float,iso646,limits,stdarg
+ */
+
+#ifdef __linux__
+#error "watchout! this is not linux but FoolOS. Use a cross-compiler"
+#endif
+
 #define FOOLOS_MODULE_NAME "kernel"
 #include "config.h"
 #include "asm/asm.h"