# Check if the tiff lib is available
AC_FIND_TIFF
AM_CONDITIONAL(have_tiff, test -n "$LIBTIFF")

AC_FIND_PNG
AM_CONDITIONAL(have_png, test -n "$LIBPNG")

AC_FIND_JPEG
AM_CONDITIONAL(have_jpeg, test -n "$LIBJPEG")

#---------------------------------------------------------
# libexif detection
# taken from libkexif's configure.in.in
#---------------------------------------------------------

LIBEXIF=no

#PKG_CHECK_MODULES(LIBEXIF, libexif >= 0.5.7, ,
#        [ AC_MSG_WARN([libexif >= 0.5.7 not found.])
#          LIBEXIF=yes ])


#PKG_CHECK_MODULES(LIBEXIF06, libexif >= 0.6.9,
#        AC_DEFINE(HAVE_EXIF06,1,[check for libexif > 0.6]),
#                AC_MSG_WARN([Using old version of libexif.]))

PKG_CHECK_MODULES(LIBEXIF, libexif >= 0.6.12 , ,
        [ AC_MSG_WARN([libexif >= 0.6.12 not found.])
          LIBEXIF=yes ])

AC_SUBST(LIBEXIF_LIBS)
AC_SUBST(LIBEXIF_CFLAGS)

#---------------------------------------------------------
# libexif detection
#---------------------------------------------------------
AC_MSG_CHECKING([if C++ program with exif can be compiled])
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS $LIBEXIF_CFLAGS"
AC_CACHE_VAL(exif_build,
[
    AC_TRY_COMPILE([
    extern "C" {
#include <libexif/exif-loader.h>
#include <libexif/exif-utils.h>
}
    ],[
        ExifLoader *l = exif_loader_new ();
        exif_loader_write_file (l,"kikoo");
        return 0;
    ], exif_build=yes,
    exif_build=no)
])
AC_MSG_RESULT($exif_build)
if test "$exif_build" = "no"; then
    LIBEXIF=""
fi
CXXFLAGS="$ac_save_CXXFLAGS"
AC_LANG_RESTORE

                
AM_CONDITIONAL(have_exif, test -n "$LIBEXIF")
AM_CONDITIONAL(include_jpeg_filter, test -n "$LIBJPEG" -a -n "$LIBEXIF")
AM_CONDITIONAL(include_tiff_filter, test -n "$LIBTIFF" -a -n "$LIBEXIF")