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diff --git a/pngwutil.c b/pngwutil.c
--- a/pngwutil.c
+++ b/pngwutil.c
@@ -336,8 +336,10 @@ png_deflate_claim(png_structrp png_ptr,
if ((png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_STRATEGY) != 0)
strategy = png_ptr->zlib_strategy;
+#ifdef PNG_WRITE_FILTER_SUPPORTED
else if (png_ptr->do_filter != PNG_FILTER_NONE)
strategy = PNG_Z_DEFAULT_STRATEGY;
+#endif
else
strategy = PNG_Z_DEFAULT_NOFILTER_STRATEGY;
@@ -823,12 +825,16 @@ png_write_IHDR(png_structrp png_ptr, png
if ((png_ptr->do_filter) == PNG_NO_FILTERS)
{
+#ifdef PNG_WRITE_FILTER_SUPPORTED
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE ||
png_ptr->bit_depth < 8)
png_ptr->do_filter = PNG_FILTER_NONE;
else
png_ptr->do_filter = PNG_ALL_FILTERS;
+#else
+ png_ptr->do_filter = PNG_FILTER_NONE;
+#endif
}
png_ptr->mode = PNG_HAVE_IHDR; /* not READY_FOR_ZTXT */
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