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< #include <gzstream.hh>
---
> #include <zfstream.h>
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< ogzstream *file = new ogzstream(filename.c_str(), mode);
---
> gzofstream *file = new gzofstream(filename.c_str(), mode);
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< ogzstream *gfs = dynamic_cast<ogzstream*>(i->second);
---
> gzofstream *gfs = dynamic_cast<gzofstream*>(i->second);