dnl Process this file with autoconf to produce a configure script.
AC_PREREQ(2.52)
AC_INIT(shftool, 1.2.0, http://www.df.lth.se/~triad/krad/shftool/)
AC_CONFIG_AUX_DIR(config)
AC_CONFIG_SRCDIR(src/shftool.c)
AM_INIT_AUTOMAKE(AC_PACKAGE_NAME, AC_PACKAGE_VERSION)


dnl Checks for programs.
AC_PROG_CC
AC_PROG_MAKE_SET
AC_PROG_INSTALL
AM_PROG_LIBTOOL
dnl AC_ARG_PROGRAM

dnl Checks for libraries.
LDFLAGS=""
LIBS=""
INCLUDES=""
LIBLOC_LIST="/usr /usr/local /opt $HOME"

dnl Checks to find Expat
AC_MSG_CHECKING(for expat)
for i in $LIBLOC_LIST; do
	dnl First check for old Expat, in order for the
	dnl new expat to override this path.
	if test -f $i/include/xmltok.h; then
		EXPAT_DIR=$i
		EXPAT_INC=include
		EXPAT_LIB=lib
		EXPAT_LINKFLAG="-lxmltok -lxmlparse"
		AC_DEFINE(HAVE_EXPAT_H, 0, [Wheter we have libexpat expat.h header])
	fi
	if test -f $i/include/xmltok/xmltok.h; then
		EXPAT_DIR=$i
		EXPAT_INC=include/xmltok
		EXPAT_LIB=lib/xmltok
		EXPAT_LINKFLAG="-lxmltok -lxmlparse"
		AC_DEFINE(HAVE_EXPAT_H, 0, [Wheter we have libexpat expat.h header])
	fi
	if test -f $i/recode/xmltok/xmltok.h; then
		EXPAT_DIR=$i/xmltok
		EXPAT_INC=include
		EXPAT_LIB=lib
		EXPAT_LINKFLAG="-lxmltok -lxmlparse"
		AC_DEFINE(HAVE_EXPAT_H, 0, [Wheter we have libexpat expat.h header])
	fi
	dnl Check for Expat 2.0
	if test -f $i/include/expat.h; then
		EXPAT_DIR=$i
		EXPAT_INC=include
		EXPAT_LIB=lib
		EXPAT_LINKFLAG=-lexpat
		AC_DEFINE(HAVE_EXPAT_H, 1, [Wheter we have libexpat expat.h header])
	fi
	if test -f $i/include/expat/expat.h; then
		EXPAT_DIR=$i
		EXPAT_INC=include/expat
		EXPAT_LIB=lib/expat
		EXPAT_LINKFLAG=-lexpat
		AC_DEFINE(HAVE_EXPAT_H, 1, [Wheter we have libexpat expat.h header])
	fi
	if test -f $i/recode/expat/expat.h; then
		EXPAT_DIR=$i/expat
		EXPAT_INC=include
		EXPAT_LIB=lib
		EXPAT_LINKFLAG=-lexpat
		AC_DEFINE(HAVE_EXPAT_H, 1, [Wheter we have libexpat expat.h header])
	fi
done
if test "$EXPAT_DIR" = ""; then
	AC_MSG_RESULT(no)
	AC_MSG_ERROR(I cannot find expat.h nor xmltok.h anywhere below $LIBLOC_LIST. Is it installed?)
else
	AC_MSG_RESULT(yes)
fi

LDFLAGS="$LDFLAGS -L$EXPAT_DIR/$EXPAT_LIB"
LIBS="$LIBS $EXPAT_LINKFLAG"
INCLUDES="$INCLUDES -I$EXPAT_DIR/$EXPAT_INC"
dnl Test the library
dnl AC_MSG_CHECKING(whether Expat library can be linked)
dnl AC_TRY_LINK([char *program_name;],[XML_Parse();],[AC_MSG_RESULT(yes)],[AC_MSG_ERROR(I cannot link expat library (-L$EXPAT_DIR/$EXPAT_LIB $EXPAT_LINKFLAG). Is it installed?)])
echo "Found Expat XML parser library in $EXPAT_DIR/$EXPAT_LIB, header file in $EXPAT_DIR/$EXPAT_INC"

dnl Tell the Makefiles.am to use these new flags
AC_SUBST(LDFLAGS)
AC_SUBST(LIBS)
AC_SUBST(INCLUDES)

dnl Checks for header files.
AC_HEADER_DIRENT
AC_HEADER_STDC
AC_CHECK_HEADERS(malloc.h stdbool.h stdlib.h string.h sys/types.h getopt.h)

dnl Checks for typedefs, structures, and compiler characteristics.
AC_C_CONST

dnl Checks for library functions.
AC_FUNC_VPRINTF

AC_SUBST(ac_aux_dir)
AC_OUTPUT([
Makefile
src/Makefile
doc/Makefile
test/Makefile
])