pyenvの共有ライブラリ問題。pyenv (pyenv does not build shared libraries by default, you have to tell it to do so when building python via pyenv), so I made a virtualenv based on the home-brew python and it works fine now (simple pyenv virtualenv system imposmenv)
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Installed ok, but error when running on OS X - Symbol not found: __ZNSs4_Rep20_S_empty_rep_storageE · Issue #37 · omniscale/imposm2
