These 2 files

  sntp/libopts/option-value-type.h
  sntp/libopts/option-xat-attribute.h

still have

  #include <inttypes.h>

However, these files are generated automatically by the autogen stuff which
will be updated by Bruce, as discussed in earlier comments, to generate code
like:

  #ifndef MISSING_INTTYPES_H
  # include <inttypes.h>
  #endif

Together with the changes I've submitted this will fix the build problems.
Until the updated autogen version is available you can edit the files after the
tarball has been unpacked and make the changes manually. After this you should
be able to build the project.