mingw build failure

[John D]

I decided to do a complete native rebuild of octave  id=132667955f66 and it
fails:

../../libinterp/dldfcn/__init_fltk__.cc: In member function 'void
fltk_uimenu::u
pdate_foregroundcolor(uimenu::properties&)':
../../libinterp/dldfcn/__init_fltk__.cc:482:43: error: 'gnulib' has not been
dec lared
../../libinterp/dldfcn/__init_fltk__.cc:483:43: error: 'gnulib' has not been
dec lared
../../libinterp/dldfcn/__init_fltk__.cc:484:43: error: 'gnulib' has not been
dec lared
make[3]: *** [dldfcn/dldfcn___init_fltk___la-__init_fltk__.lo] Error 1


Going back to previous versions that used to compile (although I probably
hadn't done a complete rebuild at that time) do the same thing.

Anyone else done a recent complete native mingw build and seen the same
issue?