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diff --git a/include/search_stack.h b/include/search_stack.h
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+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright (C) 2014 CERN
+ * Copyright (C) 1992-2014 KiCad Developers, see CHANGELOG.TXT for contributors.
+ * @author Maciej Suminski <maciej.suminski@cern.ch>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#ifndef SEARCH_STACK_H_
+#define SEARCH_STACK_H_
+
+#include <wx/filefn.h>
+#include <wx/filename.h>
+#include <project.h>
+
+
+/**
+ * Class SEARCH_STACK
+ * looks for files in a number of places.  Augments wxPathList.
+ * I chose the name because it sounded like a stack of work, as a reminder
+ * that anything you put in here means searching work at some point in time.
+ * (An alternative is to simply know where something is.)
+ */
+class SEARCH_STACK : public wxPathList, public PROJECT::_ELEM
+{
+public:
+
+#if defined(DEBUG)
+    void Show( const wxString& aPrefix ) const;
+#endif
+
+    /**
+     * Function  FilenameWithRelativePathInSearchList
+     * returns the shortest possible path which can be use later to find
+     * a full path from this SEARCH_STACK.
+     * <p>
+     * If the library path is already in the library search paths list,
+     * just add the library name to the list. Otherwise, add the library
+     * name with the full or relative path. The relative path is preferable
+     * because it preserves use of default libraries paths, when the path
+     * is a sub path of these default paths. Note we accept only sub paths
+     * not relative paths starting by ../ that are not subpaths and are
+     * outside kicad libs paths
+     *
+     * @param aFullFilename The filename with path and extension.
+     * @param aBaseDir The absolute path on which relative paths in this
+     *  SEARCH_STACK are based.
+     * @return a short filename (with extension) with only a relative path if
+     *         this filename can be found in library paths
+     */
+    wxString FilenameWithRelativePathInSearchList(
+            const wxString& aFullFilename, const wxString& aBaseDir );
+
+    wxString FindValidPath( const wxString& aFileName ) const
+    {
+#if 1   // might not be needed
+
+        if( wxFileName::FileExists( aFileName ) )
+            return aFileName;
+        else
+#endif
+            return wxPathList::FindValidPath( aFileName );
+    }
+
+    /**
+     * Function AddPaths
+     * insert or append path(s)
+     *
+     * @param aPaths = path or path list to add. paths must be
+     *  separated by ";" on windows, or ":" | ";" on unix.
+     *
+     * @param aIndex = insertion point, -1 for append.
+     */
+    void AddPaths( const wxString& aPaths, int aIndex = -1 );
+
+    /**
+     * Function RemovePaths
+     * removes the given path(s) from the library path list
+     * @param aPaths = path or list of paths to remove. If list, paths must be separated by
+     * ";" on windows, or ":" | ";" on unix.
+     */
+    void RemovePaths( const wxString& aPaths );
+
+    /**
+     * Function Split
+     * separates aPathString into individual paths.
+     * @param aResult is where to put the paths, it should be empty upon entry.
+     * @param aPathString is concatonated string with interposing ';' or ':' separators.
+     * @return int - the count of paths found in aPathString
+     */
+    static int Split( wxArrayString* aResult, const wxString aPathString );
+
+#if 1   // this function is so poorly designed it deserves not to exist.
+    /**
+     * Function LastVisitedPath
+     * is a quirky function inherited from old code that seems to serve particular
+     * needs in the UI.  It returns what is called the last visited directory, or
+     * if aSubPathToSearch is empty, the first path in this SEARCH_STACK
+     * ( but not the CWD ).
+     *
+     * @todo add more here if you can figure it out.
+     *
+     * @param aSubPathToSearch is the preferred sub path to search in path list
+     */
+    const wxString LastVisitedPath( const wxString& aSubPathToSearch = wxEmptyString );
+#endif
+
+};
+
+#endif  // SEARCH_STACK_H_