diff -Nru orig/tiff/configure.win patched/tiff/configure.win
--- orig/tiff/configure.win	2013-09-04 00:15:55.000000000 +0200
+++ patched/tiff/configure.win	2020-07-02 18:05:33.447685900 +0200
@@ -1,42 +0,0 @@
-#!/bin/sh
-
-echo "  checking TIFF headers and libraries"
-allok=yes
-
-if [ ! -e src/win32/libz.a ]; then
-    if [ ! -e src/libtiff-current-win.tar.gz ]; then
-	echo "  cannot find current TIFF files"
-	echo "  attempting to download them"
-	echo 'download.file("http://www.rforge.net/tiff/files/libtiff-current-win.tar.gz","src/libtiff-current-win.tar.gz",mode="wb",quiet=TRUE)'|${R_HOME}/bin/R --vanilla --slave
-    fi
-    if [ ! -e src/libtiff-current-win.tar.gz ]; then
-	allok=no
-    else
-	echo "  unpacking current TIFF"
-	tar fxz src/libtiff-current-win.tar.gz -C src
-        if [ ! -e src/win32/libz.a ]; then
-	    allok=no
-	fi
-    fi
-fi
-
-if [ ! -e src/win32/libz.a ]; then
-    allok=no
-fi
-
-if [ ${allok} != yes ]; then
-    echo ""
-    echo " *** ERROR: unable to find TIFF files"
-    echo ""
-    echo " They must be either in src/win32 or in a tar-ball"
-    echo " src/libtiff-current-win.tar.gz"
-    echo ""
-    echo " You can get the latest binary tar ball from"
-    echo " http://www.rforge.net/tiff/files/"
-    echo ""
-    exit 1
-fi
-
-echo "  seems ok, ready to go"
-
-exit 0
diff -Nru orig/tiff/src/Makevars.win patched/tiff/src/Makevars.win
--- orig/tiff/src/Makevars.win	2013-09-04 00:15:55.000000000 +0200
+++ patched/tiff/src/Makevars.win	2020-07-02 18:05:33.478940400 +0200
@@ -1,8 +1,8 @@
 ## detect 64-bit Windows
 ifeq ($(strip $(shell $(R_HOME)/bin/R --slave -e 'cat(.Machine$$sizeof.pointer)')),8)
 PKG_CFLAGS=-Iwin64
-PKG_LIBS=-Lwin64 -ltiff -ljpeg -lz
+PKG_LIBS=-Lwin64 -ltiff -ljpeg -lz -lzstd -lwebp -llzma
 else
 PKG_CFLAGS=-Iwin32
-PKG_LIBS=-Lwin32 -ltiff -ljpeg -lz
+PKG_LIBS=-Lwin32 -ltiff -ljpeg -lz -lzstd -lwebp -llzma
 endif