ChangeLog, getsize.c, ismounted.c, unix_io.c:
  getsize.c, ismounted.c, unix_io.c: #include errno.h since it's needed.

diff --git a/lib/ext2fs/unix_io.c b/lib/ext2fs/unix_io.c
index 4639d4f..c46602e 100644
--- a/lib/ext2fs/unix_io.c
+++ b/lib/ext2fs/unix_io.c
@@ -16,6 +16,9 @@
 #if HAVE_UNISTD_H
 #include <unistd.h>
 #endif
+#if HAVE_ERRNO_H
+#include <errno.h>
+#endif
 #include <fcntl.h>
 #include <time.h>
 #if HAVE_SYS_STAT_H