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)