Google glog is a library that implements application-level logging. This library provides logging APIs based on C++-style streams and various helper macros.
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This package contains development files for gflags.
A C++ library for commandline flag processing
The gflags package contains a library that implements commandline flags processing. As such it's a replacement for getopt(). It has increased flexibility, including built-in support for C++ types like string, and the ability to define flags in the source file in which they are used.