graphics/libheif fails to build

[Martin Husemann <martin%duskware.de@localhost>]

While trying to build xsane (with pkgsrc -current as of a few hours ago)
I ran into this:

[ 91%] Built target heif-thumbnailer
[ 92%] Linking CXX executable heif-test
[ 93%] Building CXX object examples/CMakeFiles/heif-enc.dir/decoder_tiff.cc.o
/usr/pkgobj/graphics/libheif/work/libheif-1.18.0/examples/decoder_tiff.cc:35:10: fatal error: tiff.h: No such file or directory
   35 | #include <tiff.h>
      |          ^~~~~~~~
compilation terminated.
--- examples/CMakeFiles/heif-enc.dir/decoder_tiff.cc.o ---


and the pkg doesn't seem to depend on anything that would provide tiff:

===> Installing dependencies for libheif-1.18.0
==========================================================================
The following variables will affect the build process of this package,
libheif-1.18.0.  Their current value is shown below:

        * JPEG_DEFAULT = jpeg

Based on these variables, the following variables have been set:

        * JPEGBASE (defined, but empty)
        * JPEG_TYPE = jpeg

You may want to abort the process now with CTRL-C and change the value
of variables in the first group before continuing.  Be sure to run
`/usr/bin/make clean' after the changes.
==========================================================================
=> Tool dependency cmake>=0: found cmake-3.30.0
=> Tool dependency mktools-[0-9]*: found mktools-20220614
=> Tool dependency pkgconf-[0-9]*: found pkgconf-2.2.0nb1
=> Tool dependency cwrappers>=20150314: found cwrappers-20220403
=> Tool dependency checkperms>=1.1: found checkperms-1.12
=> Full dependency png>=1.6.0nb1: found png-1.6.43
=> Full dependency dav1d>=1.3.0: found dav1d-1.4.3
=> Full dependency libaom>=3.3.0nb1: found libaom-3.9.1
=> Full dependency libde265>=1.0.6: found libde265-1.0.15
=> Full dependency svt-av1>=1.4.1: found svt-av1-1.8.0
=> Full dependency x265>=3.6: found x265-3.6
=> Full dependency jpeg>=9: found jpeg-9e


What is missing?

Martin