diff -burN tcsh-6.20.00.orig/configure tcsh-6.20.00/configure

--- tcsh-6.20.00.orig/configure	2016-11-24 18:06:40.000000000 +0300

+++ tcsh-6.20.00/configure	2017-07-20 11:35:23.852107180 +0300

@@ -4284,7 +4284,7 @@

   return 0;

 }

 _ACEOF

-for ac_lib in '' termlib termcap curses ncurses; do

+for ac_lib in '' tinfo curses ncurses; do

   if test -z "$ac_lib"; then

     ac_res="none required"

   else

diff -burN tcsh-6.20.00.orig/configure.ac tcsh-6.20.00/configure.ac

--- tcsh-6.20.00.orig/configure.ac	2016-11-24 18:04:52.000000000 +0300

+++ tcsh-6.20.00/configure.ac	2017-07-20 11:34:56.021629545 +0300

@@ -317,7 +317,7 @@

 dnl Checks for libraries

 AC_SEARCH_LIBS(crypt, crypt)

 AC_SEARCH_LIBS(getspnam, sec)

-AC_SEARCH_LIBS([tgetent], [termlib termcap curses ncurses], [], [

+AC_SEARCH_LIBS([tgetent], [tinfo curses ncurses], [], [

    AC_MSG_ERROR([unable to find the tgetent() function])

 ])

 AC_SEARCH_LIBS(gethostbyname, nsl)