Perhaps
cdl_package CYGPKG_LIBC_STDIO should have CYGFUN_LIBC_STDIO_ungetc added
to its "requires"
build fails without ungetc:
vsscanf requires vfscanf requries ungetsc
already considered but not included for some reason in stdio.cdl it seems...
requires CYGINT_ISO_STRING_STRFUNCS
96 requires CYGINT_ISO_STRING_MEMFUNCS
97 # The following is for scanf only. We could express this better,
98 # particularly since scanf is also dependent on the optional ungetc.
99 requires CYGINT_ISO_STDLIB_STRCONV
100
101 compile common/fflush.cxx common/feof.cxx \
102 common/freopen.cxx common/setvbuf.cxx \
103 common/snprintf.cxx common/sprintf.cxx \
104 common/sscanf.cxx common/stderr.cxx \
105 common/stdin.cxx common/stdiofiles.cxx \
106 common/fseek.cxx common/stdioinlines.cxx\
107 common/stdiosupp.cxx common/stdout.cxx \
108 common/stream.cxx common/streambuf.cxx \
109 common/ungetc.cxx common/vsnprintf.cxx \
110 common/vsscanf.cxx common/fileops.cxx \
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