dnl Disable configure caching ... it causes lots of hassles.
define([AC_CACHE_LOAD], )
define([AC_CACHE_SAVE], )

dnl Process this file with autoconf to produce a configure script.
AC_INIT(Makefile.in)

dnl We require autoconf 2.52+ for libtool support on cygwin/mingw hosts
AC_PREREQ(2.52)

dnl Checks for programs.
AC_PROG_CC
AC_PROG_CXX

AC_PROG_RANLIB
AC_LD_SHARED
AC_COMPILER_PIC
AC_COMPILER_WFLAGS

dnl ---------------------------------------------------------------------------
dnl Find GDAL
dnl ---------------------------------------------------------------------------

AC_ARG_WITH(gdal,
[  --with-gdal[=PATH]        GDAL (PATH is path to gdal-config)],,)

if test "$with_gdal" = "yes" -o "$with_gdal" = "" ; then

  if test "`basename xx/$with_gdal`" = "gdal-config" ; then
    GDAL_CONFIG="$with_gdal"
  fi

  if test -z "$GDAL_CONFIG" ; then
    AC_PATH_PROG(GDAL_CONFIG, gdal-config, no)
  fi

  if test "$GDAL_CONFIG" = "no" ; then
    AC_MSG_ERROR([couldn't find gdal-config])
  fi

elif test -n "$with_gdal" -a "$with_gdal" != "no" ; then

  GDAL_CONFIG=$with_gdal

  if test -f "$GDAL_CONFIG" -a -x "$GDAL_CONFIG" ; then
    AC_MSG_RESULT([user supplied gdal-config ($GDAL_CONFIG)])
  else
    AC_MSG_ERROR(['$GDAL_CONFIG' is not an executable.  Make sure you use --with-gdal=/path/to/gdal-config])
  fi

else

  AC_MSG_ERROR([gdal required to build GDAL GRASS 5.7 driver])

fi

LIBS="`$GDAL_CONFIG --libs` $LIBS"
GDAL_INC=`$GDAL_CONFIG --cflags`

AC_SUBST(GDAL_INC,    $GDAL_INC)

dnl ---------------------------------------------------------------------------
dnl Where to put driver?
dnl ---------------------------------------------------------------------------
AC_ARG_WITH(autoload,[  --with-autoload[=DIR]      Directory for autoload drivers],,)

if test "$with_autoload" != "" ; then
  AUTOLOAD_DIR=$with_autoload
else
  if $GDAL_CONFIG --autoload > /dev/null 2>&1 ; then
    AUTOLOAD_DIR=`$GDAL_CONFIG --autoload`
  else
    AUTOLOAD_DIR=`$GDAL_CONFIG --prefix`/lib/gdalplugins
  fi
fi

AC_MSG_RESULT(using $AUTOLOAD_DIR as GDAL shared library autoload directory)
AC_SUBST(AUTOLOAD_DIR,$AUTOLOAD_DIR)

dnl ---------------------------------------------------------------------------
dnl Find GRASS 5.7
dnl ---------------------------------------------------------------------------

GRASS_SETTING=no
GRASS_INCLUDE=
GRASS_GISBASE=
export GRASS_INCLUDE GRASS_SETTING GRASS_GISBASE

AC_ARG_WITH(grass,[  --with-grass[=ARG]        Include GRASS support (ARG=GRASS install tree dir)],,)

if test "$with_grass" = "no" ; then
  AC_MSG_ERROR([grass required for this driver, please install GRASS 5.7 and rebuild])
fi

if test "$with_grass" != "yes" ; then

  AC_CHECK_LIB(grass_gis,G_asprintf,GRASS_SETTING=grass57+,GRASS_SETTING=no,-L$with_grass/lib -lgrass_datetime -lgrass_gproj)
   
  if test "$GRASS_SETTING" = "grass57+" ; then   
    LIBS="-L$with_grass/lib -lgrass_I -lgrass_vask -lgrass_gmath -lgrass_gis -lgrass_datetime -lgrass_gproj $LIBS"
    GRASS_INCLUDE="-I$with_grass/include"
    GRASS_GISBASE="$with_grass"
  else
    AC_MSG_ERROR([--with-grass=$with_grass requested, but libraries not found!])
  fi
fi

AC_SUBST(GRASS_INCLUDE,$GRASS_INCLUDE)
AC_SUBST(GRASS_GISBASE,$GRASS_GISBASE)

dnl ---------------------------------------------------------------------------

rm -f conftest*

AC_OUTPUT(Makefile)