gnat-4.9: directory name problem: GNU/Hurd build

[Svante Signell <svante.signell@gmail.com>]

Hi,

After downloading gnat-4.9 to org.debian.gnat-4.9 debian/rules unpack
fails:
srs@hurd-2013:~/DEBs/gnat-4.9/org.debian.gnat-4.9$ debian/rules unpack
mkdir -p stamps
: # unpack gcc tarball
mkdir stamps
mkdir: cannot create directory `stamps': File exists
make: [stamps/01-unpack-stamp-gcc-4.9_4.9-20140122.orig.tar.gz] Error 1
(ignored)
if [ -d /home/srs/DEBs/gnat-4.9/org.debian.gnat-4.9/src ]; then \
          echo >&2 "Source
directory /home/srs/DEBs/gnat-4.9/org.debian.gnat-4.9/src exists. Delete
by hand"; \
          false; \
        fi
rm -rf gcc-4.9_4.9-20140122.orig
tar -x -f gcc-4.9_4.9-20140122.orig.tar.gz
mv
gcc-4.9_4.9-20140122.orig /home/srs/DEBs/gnat-4.9/org.debian.gnat-4.9/src
mv: cannot stat `gcc-4.9_4.9-20140122.orig': No such file or directory
make: *** [stamps/01-unpack-stamp-gcc-4.9_4.9-20140122.orig.tar.gz]
Error 1
There is a name conflict between:
gcc-4.9_4.9-20140122.orig and
gcc-4.9-4.9-20140122.orig

Do you know where the problem is, with a shallow look I didn't find it?

Any ideas?