See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=828853

--- libexplain-1.4.D001.orig/libexplain/buffer/file_inode_flags.c
+++ libexplain-1.4.D001/libexplain/buffer/file_inode_flags.c
@@ -28,6 +28,14 @@

 #if defined(FS_IOC_GETFLAGS) || defined(FS_IOC32_GETFLAGS)

+#ifndef FS_ECOMPR_FL
+#define FS_ECOMPR_FL                    0x00000800 /* Compression error */
+#endif
+
+#ifndef FS_DIRECTIO_FL
+#define FS_DIRECTIO_FL                  0x00100000 /* Use direct i/o */
+#endif
+
 void
 explain_buffer_file_inode_flags(explain_string_buffer_t *sb, int value)
 {