--- patch99/third_party/pdfium/core/fxcodec/tiff/tiff_decoder.cpp	2022-02-10 05:21:05.000000000 +0100
+++ patch99/third_party/pdfium/core/fxcodec/tiff/tiff_decoder.cpp.system-libtiff	2022-02-14 15:21:53.169231723 +0100
@@ -22,9 +22,7 @@
 #include "third_party/base/notreached.h"
 #include "third_party/base/numerics/safe_conversions.h"
 
-extern "C" {
-#include "third_party/libtiff/tiffiop.h"
-}  // extern C
+#include <tiffio.h>
 
 namespace {
 
@@ -190,7 +188,7 @@ TIFF* tiff_open(void* context, const cha
                              tiff_write, tiff_seek, tiff_close, tiff_get_size,
                              tiff_map, tiff_unmap);
   if (tif) {
-    tif->tif_fd = (int)(intptr_t)context;
+    (void)TIFFSetFileno(tif, (int)(intptr_t)context);
   }
   return tif;
 }
diff -up chromium-60.0.3112.40/third_party/pdfium/third_party/BUILD.gn.pdfium-system-libtiff-libpng chromium-60.0.3112.40/third_party/pdfium/third_party/BUILD.gn
--- chromium-60.0.3112.40/third_party/pdfium/third_party/BUILD.gn.pdfium-system-libtiff-libpng	2017-06-22 00:04:10.000000000 +0200
+++ chromium-60.0.3112.40/third_party/pdfium/third_party/BUILD.gn	2017-06-24 22:25:18.901585830 +0200
@@ -501,59 +501,13 @@ source_set("fx_lpng") {
   }
 }
 
+config("fx_tiff_config") {
+  libs = [ "tiff" ]
+}
+
 if (pdf_enable_xfa_tiff) {
   source_set("fx_tiff") {
-    configs -= [ "//build/config/compiler:chromium_code" ]
-    configs += [
-      "//build/config/compiler:no_chromium_code",
-      ":pdfium_third_party_config",
-    ]
-    if (is_win) {
-      # Need to undefine the macro since it is redefined in tif_jpeg.c.
-      configs -= [ "//build/config/win:lean_and_mean" ]
-    }
-    deps = [
-      ":zlib",
-      "../core/fxcrt",
-      "//third_party:jpeg",
-    ]
-    sources = [
-      "libtiff/tif_aux.c",
-      "libtiff/tif_close.c",
-      "libtiff/tif_codec.c",
-      "libtiff/tif_color.c",
-      "libtiff/tif_compress.c",
-      "libtiff/tif_dir.c",
-      "libtiff/tif_dirinfo.c",
-      "libtiff/tif_dirread.c",
-      "libtiff/tif_dirwrite.c",
-      "libtiff/tif_dumpmode.c",
-      "libtiff/tif_error.c",
-      "libtiff/tif_extension.c",
-      "libtiff/tif_fax3.c",
-      "libtiff/tif_fax3sm.c",
-      "libtiff/tif_flush.c",
-      "libtiff/tif_getimage.c",
-      "libtiff/tif_jpeg.c",
-      "libtiff/tif_luv.c",
-      "libtiff/tif_lzw.c",
-      "libtiff/tif_next.c",
-      "libtiff/tif_open.c",
-      "libtiff/tif_packbits.c",
-      "libtiff/tif_pixarlog.c",
-      "libtiff/tif_predict.c",
-      "libtiff/tif_print.c",
-      "libtiff/tif_read.c",
-      "libtiff/tif_strip.c",
-      "libtiff/tif_swab.c",
-      "libtiff/tif_thunder.c",
-      "libtiff/tif_tile.c",
-      "libtiff/tif_version.c",
-      "libtiff/tif_warning.c",
-      "libtiff/tif_write.c",
-      "libtiff/tiffiop.h",
-      "libtiff/tiffvers.h",
-    ]
+    public_configs = [ ":fx_tiff_config" ]
   }
 }