add missing include

diff --git a/indent.c b/indent.c
index 025aac814799a3b66180f10ab25206d2c16d51e7..26b19288163877e594201fe048c3e0d0273f2fcb 100644 (file)
--- a/indent.c
+++ b/indent.c
@@ -3,6 +3,7 @@
 /* linker: debug.o */
 
 #include <assert.h>
+#include <errno.h>
 #include <getopt.h>
 #include <malloc.h>
 #include <stdio.h>