gb build error

gistfile1.txt

[cryptix@higgs ~/devel/cznicZappy/src/github.com/cznic/zappy:master] gb build -v all
2015/04/29 13:58:37 INFO project root "/home/cryptix/devel/cznicZappy"
2015/04/29 13:58:37 DEBUG matchPackages: [/home/cryptix/devel/cznicZappy/src] all
2015/04/29 13:58:37 DEBUG args: [github.com/cznic/zappy]
2015/04/29 13:58:37 DEBUG loadPackage: github.com/cznic/zappy
2015/04/29 13:58:37 DEBUG buildPackage: github.com/cznic/zappy
2015/04/29 13:58:37 INFO compile github.com/cznic/zappy [decode.go encode.go zappy.go]
2015/04/29 13:58:37 DEBUG gc:gc {github.com/cznic/zappy /home/cryptix/devel/cznicZappy/src/github.com/cznic/zappy /tmp/gb643192531/github.com/cznic/zappy.a [decode.go encode.go zappy.go]}
2015/04/29 13:58:37 DEBUG cd /home/cryptix/devel/cznicZappy/src/github.com/cznic/zappy; [/home/cryptix/gosrc/pkg/tool/linux_amd64/6g -p github.com/cznic/zappy -pack -o /tmp/gb643192531/github.com/cznic/zappy.a -I /tmp/gb643192531 -I /home/cryptix/devel/cznicZappy/pkg/linux/amd64 decode.go encode.go zappy.go]
2015/04/29 13:58:37 INFO pack [[compile {zappy github.com/cznic/zappy /home/cryptix/devel/cznicZappy/src/github.com/cznic/zappy}]]
2015/04/29 13:58:37 DEBUG cd /tmp/gb643192531/github.com/cznic; [/home/cryptix/gosrc/pkg/tool/linux_amd64/pack r /tmp/gb643192531/github.com/cznic/zappy.a]
2015/04/29 13:58:37 DEBUG failed cmd output:
Usage: pack op file.a [name....]
Where op is one of cprtx optionally followed by v for verbose output.
For compatibility with old Go build environments the op string grc is
accepted as a synonym for c.

For more information, run
	godoc cmd/pack
2015/04/29 13:58:37 INFO build duration: 5.180692ms map[compile:3.488091ms pack:742.766µs]
2015/04/29 13:58:37 command "build" failed: run: [/home/cryptix/gosrc/pkg/tool/linux_amd64/pack r /tmp/gb643192531/github.com/cznic/zappy.a]: [/home/cryptix/gosrc/pkg/tool/linux_amd64/pack r /tmp/gb643192531/github.com/cznic/zappy.a]: exit status 2
[cryptix@higgs ~/devel/cznicZappy/src/github.com/cznic/zappy:master]