--- gettext-0.16/gettext-tools/doc/Makefile.am
+++ gettext-0.16/gettext-tools/doc/Makefile.am
@@ -40,6 +40,7 @@
   $(top_srcdir)/../gettext-runtime/doc/rt-ngettext.texi \
   $(top_srcdir)/../gettext-runtime/doc/rt-envsubst.texi
 
+docdir=@docdir@
 # The FAQ. To be edited with Mozilla.
 # The tutorial. To be edited by hand.
 doc_DATA = FAQ.html tutorial.html