--- Makefile.in.orig	2019-01-29 07:52:25 UTC
+++ Makefile.in
@@ -173,7 +173,7 @@ sbindir = @sbindir@
 sharedstatedir = @sharedstatedir@
 sysconfdir = @sysconfdir@
 target_alias = @target_alias@
-SUBDIRS = lib tools test include doc
+SUBDIRS = lib tools test include
 dist_noinst_DATA = COPYING.txt
 all: config.h
 	$(MAKE) $(AM_MAKEFLAGS) all-recursive