Guilt reports unsupported os

[Waffle Souffle]

guilt push -a
Unsupported operating system: CYGWIN_NT-6.1
cygcheck.out attached.
/cygdrive/c/cygwin/bin/guilt line 871
if [ -r "`dirname $0`/os.$UNAME_S" ]; then
. "`dirname $0`/os.$UNAME_S"
elif [ -r "`dirname $0`/../lib/guilt/os.$UNAME_S" ]; then
. "`dirname $0`/../lib/guilt/os.$UNAME_S"
else
  die "Unsupported operating system: $UNAME_S"
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