diff -ruN a/libtiff/CMakeLists.txt b/libtiff/CMakeLists.txt
--- a/libtiff/CMakeLists.txt	2019-05-31 13:05:22.849705817 +0000
+++ b/libtiff/CMakeLists.txt	2020-11-27 21:50:03.527831837 +0000
@@ -42,6 +42,9 @@
   libtiffxx.map)
 
 set(tiff_HEADERS
+  tiffiop.h
+  ${CMAKE_CURRENT_BINARY_DIR}/tif_config.h
+  tif_dir.h
   tiff.h
   tiffio.h
   tiffvers.h)