Specify source and target to avoid build error

[soarez]

Related to spring-attic/gs-maven#21

[codecov-io]

Codecov Report

Merging #229 into master will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #229      +/-   ##
==========================================
- Coverage   54.57%   54.53%   -0.05%     
==========================================
  Files         273      273              
  Lines       87907    87908       +1     
==========================================
- Hits        47979    47937      -42     
- Misses      39928    39971      +43

Impacted Files	Coverage Δ
src/cc/tools/qfs_main.cc	65.3% <0%> (-1.34%)	⬇️
src/cc/chunk/DiskIo.cc	64.62% <0%> (-1.1%)	⬇️
src/cc/common/Properties.cc	65.3% <0%> (-0.41%)	⬇️
src/cc/chunk/ChunkManager.cc	56.42% <0%> (-0.25%)	⬇️
src/cc/meta/ChunkServer.cc	57.92% <0%> (-0.17%)	⬇️
src/cc/libclient/Reader.cc	71.48% <0%> (-0.16%)	⬇️
src/cc/qcdio/QCDiskQueue.cc	68.64% <0%> (-0.09%)	⬇️
src/cc/meta/LayoutManager.cc	48.66% <0%> (-0.08%)	⬇️
src/cc/libclient/RSStriper.cc	77.4% <0%> (-0.05%)	⬇️
src/cc/chunk/KfsOps.cc	56.3% <0%> (-0.04%)	⬇️
... and 6 more

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