treesheets-git installation failure with unversioned wxgtk

gistfile1.txt

$ makepkg
==> Making package: treesheets-git 1d0b1a8-1 (Thu Feb 20 23:40:23 EST 2014)
==> Checking runtime dependencies...
==> Checking buildtime dependencies...
==> Retrieving sources...
  -> Updating treesheets git repo...
Fetching origin
  -> Found treesheets.desktop
==> Validating source files with sha1sums...
    treesheets ... Skipped
    treesheets.desktop ... Passed
==> Extracting sources...
  -> Creating working copy of treesheets git repo...
Cloning into 'treesheets'...
done.
Branch makepkg set up to track remote branch master from origin.
Switched to a new branch 'makepkg'
==> Starting pkgver()...
==> Removing existing pkg/ directory...
==> Starting build()...
In file included from main.cpp:124:0:
myframe.h: In member function 'virtual void treesheets::MyFrame::MyFrame(wxString, wxApp*)::MyLog::DoLogText(const wxString&)':
myframe.h:60:35: error: cannot convert 'const wxString' to 'const wchar_t*' for argument '1' to 'int fputws(const wchar_t*, __FILE*)'
                 fputws(msg, stderr);
                                   ^
==> ERROR: A failure occurred in build().
    Aborting...