+dnl
+dnl Check for termcap libraries
+dnl
+AC_CHECK_LIB(termcap, tgetent, [termcap_lib=yes], [termcap_lib=no])
+if test "$termcap_lib" = no; then
+ if test "$READLINE" = "-lreadline -ltermcap"; then
+ AC_MSG_ERROR(You need to install the GNU termcap libraries first)
+ fi
+fi
+
+dnl
+dnl Check for readline headers and libraries
+dnl
+AC_CHECK_HEADER(readline/readline.h, [readline_h=yes], [readline_h=no])
+AC_CHECK_LIB(readline, readline, [readline_lib=yes], [readline_lib=no], "-ltermcap")
+if test "$readline_h" = no -o "$readline_lib" = no; then
+ if test "$READLINE" = "-lreadline -ltermcap"; then
+ AC_MSG_ERROR(You need to install the GNU readline libraries first)
+ fi
+fi
+
+dnl
+dnl Check for zlib headers and libraries
+dnl
+AC_CHECK_HEADER(zlib.h, [zlib_h=yes], [zlib_h=no])
+AC_CHECK_LIB(z, compress2, [zlib_lib=yes], [zlib_lib=no])
+if test "$zlib_h" = yes -a "$zlib_lib" = yes; then
+ ZLIB="-lz"
+ AC_DEFINE(HAVE_ZLIB)
+else
+ ZLIB=""
+fi
+AC_SUBST(ZLIB)
+