/usr/share/doc-base/gflags is in libgflags-doc 2.2.1-1.
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Title: How To Use Gflags (formerly Google Commandline Flags)
Author: Craig Silverstein
Abstract: Manual for Gflags
Section: Programming/C++
Format: HTML
Index: /usr/share/doc/libgflags-doc/index.html
Files: /usr/share/doc/libgflags-doc/index.html /usr/share/doc/libgflags-doc/designstyle.css
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