MSX-DOS 2 I/O library beta

I've found that for strange reasons HTC, targeting CPM, does not link correctly fopen, fclose, fgetc etc etc.
I'm a newcomer to msxdos, so I converted to HTC the msxdos2 libs for SDCC by http://msx.atlantes.org/index_en.html
Any testing is welcome.
I'd like to do the same for the old msxdos (msxdos2 isn't very common on msx1).
Any help or suggestion is welcome (it would be great to start from another C library supporting msxdos1)