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dnl Based on Xpdf configure.in and evince configure.ac
dnl Based on kde acinclude.m4.in, LGPL Licensed

AC_DEFUN([AC_FIND_FILE],
[
$3=NO
for i in $2;
do
  for j in $1;
  do
    echo "configure: __oline__: $i/$j" >&AC_FD_CC
    if test -r "$i/$j"; then
      echo "taking that" >&AC_FD_CC
      $3=$i
      break 2
    fi
  done
done
])

AC_DEFUN([KDE_FIND_JPEG_HELPER],
[
AC_MSG_CHECKING([for libjpeg$2])
AC_CACHE_VAL(ac_cv_lib_jpeg_$1,
[
ac_save_LIBS="$LIBS"
LIBS="$all_libraries $USER_LDFLAGS -ljpeg$2 -lm"
ac_save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS $all_includes $USER_INCLUDES"
AC_TRY_LINK(
[
#ifdef __cplusplus
extern "C" {
#endif
void jpeg_CreateDecompress();
#ifdef __cplusplus
}
#endif
],
[jpeg_CreateDecompress();],
            eval "ac_cv_lib_jpeg_$1=-ljpeg$2",
            eval "ac_cv_lib_jpeg_$1=no")
LIBS="$ac_save_LIBS"
CFLAGS="$ac_save_CFLAGS"
])

if eval "test ! \"`echo $ac_cv_lib_jpeg_$1`\" = no"; then
  enable_libjpeg=yes
  LIBJPEG_LIBS="$ac_cv_lib_jpeg_$1"
  AC_MSG_RESULT($ac_cv_lib_jpeg_$1)
else
  AC_MSG_RESULT(no)
  $3
fi
])


AC_DEFUN([POPPLER_FIND_JPEG],
[
dnl first look for libraries
KDE_FIND_JPEG_HELPER(6b, 6b,
   KDE_FIND_JPEG_HELPER(normal, [],
    [
       LIBJPEG_LIBS=
    ]
   )
)

dnl then search the headers (can't use simply AC_TRY_xxx, as jpeglib.h
dnl requires system dependent includes loaded before it)
AC_CHECK_HEADER([jpeglib.h], [jpeg_incdir=yes], [jpeg_incdir=NO])
test "x$jpeg_incdir" = xNO && jpeg_incdir=

dnl if headers _and_ libraries are missing, this is no error, and we
dnl continue with a warning (the user will get no jpeg support)
dnl if only one is missing, it means a configuration error, but we still
dnl only warn
if test -n "$jpeg_incdir" && test -n "$LIBJPEG_LIBS" ; then
  AC_DEFINE_UNQUOTED(ENABLE_LIBJPEG, 1, [Define if you have libjpeg])
else
  if test -n "$jpeg_incdir" || test -n "$LIBJPEG_LIBS" ; then
    AC_MSG_WARN([
There is an installation error in jpeg support. You seem to have only one
of either the headers _or_ the libraries installed. You may need to either
provide correct --with-extra-... options, or the development package of
libjpeg6b. You can get a source package of libjpeg from http://www.ijg.org/
Disabling JPEG support.
])
  else
    AC_MSG_WARN([libjpeg not found. disable JPEG support.])
  fi
  jpeg_incdir=
  enable_libjpeg=no
  LIBJPEG_LIBS=
fi

AC_SUBST(LIBJPEG_LIBS)
AH_VERBATIM(_AC_CHECK_JPEG,
[/*
 * jpeg.h needs HAVE_BOOLEAN, when the system uses boolean in system
 * headers and I'm too lazy to write a configure test as long as only
 * unixware is related
 */
#ifdef _UNIXWARE
#define HAVE_BOOLEAN
#endif
])
])