mtools commands use cp850 as the "mtools_default_codepage", they would use cp850 to do covert works. Because mtools has no RDEPENDS for glibc-gconv-ibm850, many commands would run to fail.

Test steps:

root@qemux86-64:~# dd if=/dev/zero of=floppy.img bs=1024 count=1440
1440+0 records in
1440+0 records out
1474560 bytes (1.5 MB) copied, 0.470088 s, 3.1 MB/s

root@qemux86-64:~# losetup  /dev/loop0 floppy.img

root@qemux86-64:~# mkdosfs /dev/loop0
mkdosfs 2.11 (12 Mar 2005)

root@qemux86-64:~# mcopy -i /dev/loop0 test.log ::
Error converting to codepage 850 Invalid argument 
Cannot initialize '::'
Bad target ::

So, I will add glibc-gconv-ibm850 to RDEPENDS, and add other DOS/FAT codepages related packages to RRECOMMENDS.