dnl $Id: configure.in,v 1.5 2002/01/05 02:19:00 c-hey Exp $
dnl Process this file with autoconf to produce a configure script.

dnl Initialise. This can be passed any old file. 
AC_INIT(hey_arg.h)
AC_CONFIG_HEADER(config.h)

AC_ARG_VAR(WRITE, path to a write-like utility)

dnl Checks for programs.
AC_PROG_CC

dnl
dnl if the user hasn't specified CFLAGS, then
dnl   if compiler is gcc, then use -O2 and some warning flags
dnl   else use os-specific flags or -O
dnl

if test -n "$GCC"; then
	CFLAGS="-O2 -Wall -pedantic"
else
	case "$host_os" in
		*hpux*)  CFLAGS=" +O3"                      ;;
		*ultrix* | *osf*) CFLAGS=" -O -Olimit 2000" ;;
		*)       CFLAGS=" -O" ;;
	esac
fi

AC_PROG_INSTALL
AC_PROG_LN_S
AC_PATH_PROG(WRITE, write , :) 

if test "$WRITE" = ":" ; then
	echo "Sorry, but write is a requirement to build hey."
	echo "please run ./configure write=/path/to/binary to"
	echo "compile with a different write-like utility"
	exit
fi

AC_PROG_MAKE_SET

dnl Checks for libraries.

dnl Checks for header files.
AC_HEADER_STDC
AC_CHECK_HEADERS(utmpx.h)

dnl Checks for typedefs, structures, and compiler characteristics.

dnl Checks for library functions.
AC_TYPE_SIGNAL
AC_FUNC_VPRINTF
AC_CHECK_FUNCS(strdup,,STRDUP_OBJ=mystrdup.o)
AC_CHECK_FUNCS(getutent,,UT_OBJ=utent.o)

dnl we have to initalise this
dnl using success arg of lib check skews config.h
EDIT_OBJ=hey_edit.o

dnl the following two checks are ugly but neccessary
dnl autoconfs extra library feature for AC_CHECK_LIB
dnl simply does not work, and fails to register readline
dnl on systems where curses isnt needed for it

dnl vanilla readline check, works on 90% of systems
AC_CHECK_LIB(readline, readline, , NOREADLINE=1)

dnl readline doesnt work, try it with curses
dnl
dnl this stuff is overly dependent on autoconf internals
dnl better suggestions welcome
dnl
if test -n "$NOREADLINE" ; then
	AC_CHECK_LIB(readline -lcurses ,readline, 

		AC_DEFINE(HAVE_LIBREADLINE) 
		LIBS="$LIBS -lreadline -lcurses" 

		, 

		echo
		echo "WARNING: you are compiling c-hey WITHOUT readline support"
		echo "         we recommend you install the readline library and"
		echo "         associated development materials to utilise the"
		echo "         full functionality of c-hey"
		echo
		echo "         get it at: "
		echo "         http://cnswww.cns.cwru.edu/php/chet/readline/rltop.html"
		echo

		# dont want edit object now 
		EDIT_OBJ=""
	)
fi


dnl check for rl_ding()
AC_CHECK_FUNCS(rl_ding)

dnl Make any macro substitutions that we ought to. 
AC_SUBST(UT_OBJ)
AC_SUBST(EDIT_OBJ)
AC_SUBST(WRITE)

AC_OUTPUT(Makefile)