1 files changed, 3 insertions, 0 deletions
diff --git a/files.h b/files.h
index 63b1c0f..b82ead4 100644
--- a/files.h
+++ b/files.h
@@ -6,6 +6,9 @@
 
 #include <stdbool.h>
 #include <stdio.h>
+#include <unistd.h>
+
+#define file_err(f, ...) do { fprint_line(stderr, f, __VA_ARGS__); exit(EXIT_FAILURE); } while(false)
 
 struct allocated_pat_s; // declared in types.h