The update to 3d6af11 introduced a bug that caused the build to fail
when the port's pgtk knob was off.
cc -o temacs.tmp ...
ld: error: undefined symbol: x_scroll_bar_redraw >>> referenced by xterm.c >>> xterm.o:(XTset_vertical_scroll_bar)
Changes: https://github.com/emacs-mirror/emacs/compare/3d6af11...261d6af