diff --git i/libtiff/Makefile.am w/libtiff/Makefile.am
index 44522b62..d66e5948 100644
--- i/libtiff/Makefile.am
+++ w/libtiff/Makefile.am
@@ -36,8 +36,11 @@ EXTRA_DIST = \
 	tiffconf.h.cmake.in
 
 libtiffinclude_HEADERS = \
+	tif_config.h \
+	tif_dir.h \
 	tiff.h \
 	tiffio.h \
+	tiffiop.h \
 	tiffvers.h
 
 if HAVE_CXX