1 files changed, 10 insertions, 0 deletions
diff --git a/tutorial/chapter-9/lib/lib.c b/tutorial/chapter-9/lib/lib.c
new file mode 100644
index 000000000..5dcae0de3
--- /dev/null
+++ b/tutorial/chapter-9/lib/lib.c
@@ -0,0 +1,10 @@
+#include "lib.h"
+
+#ifndef CRUCIAL_DEFINE
+#   error CRUCIAL_DEFINE not defined
+#endif
+
+const char *get_string()
+{
+    return "Hello from library";
+}