diff --git a/info/Makefile.am b/info/Makefile.am
index 4752a11..73c6d25 100644
--- a/info/Makefile.am
+++ b/info/Makefile.am
@@ -2,7 +2,7 @@
 # Makefile.am for texinfo/info.
 #
 # Copyright 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012,
-# 2013, 2014, 2015, 2016, 2017 Free Software Foundation, Inc.
+# 2013, 2014, 2015, 2016, 2017, 2018, 2019 Free Software Foundation, Inc.
 #
 # This file is free software; as a special exception the author gives
 # unlimited permission to copy and/or distribute it, with or without
@@ -26,7 +26,7 @@ AM_CPPFLAGS =                                   \
   -DINFODIR=\"$(infodir)\"                      \
   -DINFODIR2=\"$(datadir)/info\"
 
-LDADD = $(top_builddir)/gnulib/lib/libgnu.a $(TERMLIBS) $(LIBINTL) $(LIBICONV)
+LDADD = $(top_builddir)/gnulib/lib/libgnu.a $(TERMLIBS) $(LIBINTL) $(LIBICONV) $(LIBTHREAD)
 
 EXTRA_DIST = pcterm.c
 
diff --git a/install-info/Makefile.am b/install-info/Makefile.am
index 5384f8b..9bcff71 100644
--- a/install-info/Makefile.am
+++ b/install-info/Makefile.am
@@ -33,4 +33,4 @@ AM_CPPFLAGS = 					\
   -I$(top_srcdir)/gnulib/lib			\
   -I$(top_builddir)/gnulib/lib			\
   -DLOCALEDIR=\"$(localedir)\"
-LDADD = $(top_builddir)/gnulib/lib/libgnu.a $(LIBINTL)
+LDADD = $(top_builddir)/gnulib/lib/libgnu.a $(LIBINTL) $(LIBTHREAD)