run ("cd pspp$build_number/_build && make dist", "dist");
my $tarname = "pspp-$version.tar.gz";
$tarball = save_result ("source distribution", "pspp$build_number/_build/$tarname", 1);
run ("cd pspp$build_number/_build && make dist", "dist");
my $tarname = "pspp-$version.tar.gz";
$tarball = save_result ("source distribution", "pspp$build_number/_build/$tarname", 1);