AC_DEFUN([AC_IMAGE_SUPPORT],

[

AH_TEMPLATE([JPEG_SUPPORTED], [Use libjpeg library])

AH_TEMPLATE([PNG_SUPPORTED], [Use libpng library])

AC_ARG_ENABLE(jpeg,           [  --enable-jpeg           Enable JPEG support],,[enable_jpeg=yes])

AC_ARG_WITH(libjpeg_includes, [  --with-libjpeg-includes=DIR   Use libjpeg includes in DIR], libjpeg_includes=$withval)

AC_ARG_WITH(libjpeg_lib,      [  --with-libjpeg-lib=DIR        Use libjpeg library in DIR], libjpeg_lib=$withval)

AC_ARG_ENABLE(png,            [  --enable-png            Enable PNG support],,[enable_png=yes])

AC_ARG_WITH(libpng_includes,  [  --with-libpng-includes=DIR    Use libpng includes in DIR], libpng_includes=$withval)

AC_ARG_WITH(libpng_lib,       [  --with-libpng-lib=DIR         Use libpng library in DIR], libpng_lib=$withval)

#

# Check libjpeg configuration

#

if test "$enable_jpeg" = "yes"

then

    if test "$libjpeg_includes"

    then

	    LIBJPEG_CFLAGS="-I$libjpeg_includes"

    fi

    if test "$libjpeg_lib"

    then

    	LIBJPEG_LIBS="-L$libjpeg_lib -ljpeg"

    else

    	LIBJPEG_LIBS="-ljpeg"

    fi

    saved_LIBS="$LIBS"

    LIBS="$LIBS $LIBJPEG_LIBS"

    saved_CFLAGS="$CFLAGS"

    CFLAGS="$CFLAGS $LIBJPEG_CFLAGS"

    AC_CHECK_HEADERS(jpeglib.h, libjpeg_headers_present="yes")

    AC_CHECK_FUNCS(jpeg_start_decompress, libjpeg_present="yes")

    if test "$libjpeg_present" = "yes" -a "$libjpeg_headers_present" = "yes"

    then

        AC_SUBST(LIBS)	

	use_libjpeg=yes

        AC_DEFINE(JPEG_SUPPORTED, 1, We have discovered the libjpeg library)

    else

        CFLAGS="$saved_CFLAGS"

        LIBS="$saved_LIBS"

    fi

fi

AM_CONDITIONAL(OM_LIBJPEG, test "$use_libjpeg" = "yes")

#

# Check libpng configuration

#

if test "$enable_png" = "yes"

then

    if test "$libpng_includes"

    then

	    LIBPNG_CFLAGS="-I$libpng_includes"

    fi

    if test "$libpng_lib"

    then

    	LIBPNG_LIBS="-L$libpng_lib -lpng"

    else

    	LIBPNG_LIBS="-lpng"

    fi

    saved_LIBS="$LIBS"

    LIBS="$LIBS $LIBPNG_LIBS"

    saved_CFLAGS="$CFLAGS"

    CFLAGS="$CFLAGS $LIBPNG_CFLAGS"

    AC_CHECK_HEADERS(png.h, libpng_headers_present="yes")

    AC_CHECK_FUNCS(png_create_read_struct, libpng_present="yes")

    if test "$libpng_present" = "yes" -a "$libpng_headers_present" = "yes"

    then

        AC_SUBST(LIBS)	

	use_libpng=yes

        AC_DEFINE(PNG_SUPPORTED, 1, We have discovered the libpng library)

    else

	CFLAGS="$saved_CFLAGS"

	LIBS="$saved_LIBS"

    fi

fi

AM_CONDITIONAL(OM_LIBPNG, test "$use_libpng" = "yes")

])