+ AC_DEFINE(HAVE_GIF, 1, [Define to 1 if you have a gif library (default -lgif; otherwise specify with LIBGIF).])
+ fi
+fi
+
+dnl Check for required libraries.
+if test "${HAVE_X11}" = "yes"; then
+ MISSING=""
+ WITH_NO=""
+ test "${with_xpm}" != "no" && test "${HAVE_XPM}" != "yes" &&
+ MISSING="libXpm" && WITH_NO="--with-xpm=no"
+ test "${with_jpeg}" != "no" && test "${HAVE_JPEG}" != "yes" &&
+ MISSING="$MISSING libjpeg" && WITH_NO="$WITH_NO --with-jpeg=no"
+ test "${with_png}" != "no" && test "${HAVE_PNG}" != "yes" &&
+ MISSING="$MISSING libpng" && WITH_NO="$WITH_NO --with-png=no"
+ test "${with_gif}" != "no" && test "${HAVE_GIF}" != "yes" &&
+ MISSING="$MISSING libgif/libungif" && WITH_NO="$WITH_NO --with-gif=no"
+ test "${with_tiff}" != "no" && test "${HAVE_TIFF}" != "yes" &&
+ MISSING="$MISSING libtiff" && WITH_NO="$WITH_NO --with-tiff=no"
+
+ if test "X${MISSING}" != X; then
+ AC_MSG_ERROR([The following required libraries were not found:
+ $MISSING
+Maybe some development libraries/packages are missing?
+If you don't want to link with them give
+ $WITH_NO
+as options to configure])