/usr/share/GNUstep/Documentation/Developer/Tools/ is in gnustep-base-doc 1.22.1-2ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/AGSHtml.gsdoc
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/AGSHtml.html
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/AGSIndex.gsdoc
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/AGSIndex.html
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/AGSOutput.gsdoc
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/AGSOutput.html
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/AGSParser.gsdoc
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/AGSParser.html
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/BaseTools.gsdoc
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/BaseTools.html
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/BaseTools.igsdoc
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/ClassesTOC.gsdoc
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/ClassesTOC.html
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/FunctionsTOC.gsdoc
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/FunctionsTOC.html
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/MacrosTOC.gsdoc
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/MacrosTOC.html
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/MainIndex.html
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/OrderedSymbolDeclarations.plist
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/ToolsTOC.gsdoc
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/ToolsTOC.html
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/VariablesTOC.gsdoc
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/VariablesTOC.html
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/autogsdoc.gsdoc
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/autogsdoc.html
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/cvtenc.gsdoc
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/cvtenc.html
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/defaults.gsdoc
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/defaults.html
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/gdnc.gsdoc
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/gdnc.html
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/gdomap.gsdoc
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/gdomap.html
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/gsdoc.gsdoc
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/gsdoc.html
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/gspath.gsdoc
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/gspath.html
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/index.html
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/pldes.gsdoc
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/pldes.html
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/plmerge.gsdoc
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/plmerge.html
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/plparse.gsdoc
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/plparse.html
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/plser.gsdoc
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/plser.html
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/sfparse.gsdoc
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/sfparse.html
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/xmlparse.gsdoc
/usr/share/GNUstep/Documentation/Developer/Tools/Reference/xmlparse.html